EP1116086A2 - Systeme et procede permettant l'acces et l'exploitation a distance sur ordinateur personnel - Google Patents

Systeme et procede permettant l'acces et l'exploitation a distance sur ordinateur personnel

Info

Publication number
EP1116086A2
EP1116086A2 EP99969512A EP99969512A EP1116086A2 EP 1116086 A2 EP1116086 A2 EP 1116086A2 EP 99969512 A EP99969512 A EP 99969512A EP 99969512 A EP99969512 A EP 99969512A EP 1116086 A2 EP1116086 A2 EP 1116086A2
Authority
EP
European Patent Office
Prior art keywords
video
host
key
mouse
remote
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP99969512A
Other languages
German (de)
English (en)
Other versions
EP1116086B1 (fr
Inventor
Robin L. Anderson
Ronald J. Perholtz
Dennis Hawkins
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Avocent Huntsville LLC
Original Assignee
Cybex Computer Products Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cybex Computer Products Corp filed Critical Cybex Computer Products Corp
Publication of EP1116086A2 publication Critical patent/EP1116086A2/fr
Application granted granted Critical
Publication of EP1116086B1 publication Critical patent/EP1116086B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/038—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/02—Input arrangements using manually operated switches, e.g. using keyboards or dials
    • G06F3/023—Arrangements for converting discrete items of information into a coded form, e.g. arrangements for interpreting keyboard generated codes as alphanumeric codes, operand codes or instruction codes
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
    • G06F3/1454—Digital output to display device ; Cooperation and interconnection of the display device with other functional units involving copying of the display data of a local workstation or window to a remote workstation or window so that an actual copy of the data is displayed simultaneously on two or more displays, e.g. teledisplay
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
    • H04L67/125—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks involving control of end-device applications over a network

Definitions

  • This invention relates to remote computer access, and more particularly to hardware and software for coordinating video, keyboard and mouse information transfers and control to/from a remote PC and one or more host PCs.
  • U.S. Patent No. 5,732,212 which is inco ⁇ orated herein by reference, disclosed a prior art remote access product that was marketed as so-called KEY- VIEW. Keyview was a custom designed hardware unit externally connected to a Host PC that had a proprietary internal software operating system which serviced a remote user. Proprietary software operating on a Remote User's PC was used to remotely access the KEY- VIEW unit at the Host site. A Remote user running this proprietary software required only a standard modem and PC to access any Host site.
  • KEY- VIEW II a single KEY- VIEW PC permits remote control of a plurality of Host PCs alone or in combination with third party switch boxes and allows help desk and maintenance personnel to be highly centralized, but still respond to support calls, as if they were on-site. This means KEY- VIEW dramatically cuts down-time as well as costs for maintenance and technical support.
  • a standard remote access engine such as pcAnywhere is used to remotely access a KEY- VIEW PC.
  • pcAnywhere in combination with the KEY- VIEW PC permit access via a LAN, modem, the Internet and/or direct serial or parallel port access.
  • pcAnywhere supports TCIP access, so customers may access the KEY- VIEW II PC over the Internet and launch, monitor and control applications running any Host computer connected to the Host PC even in distant international locations, as if they were actually on site.
  • the example embodiment described herein uses the remote access package, pcAnywhere, using the latest 32 bit technology. But, other remote access engines can be substituted.
  • KEY- VIEW II improves control of "Host" PCs from a remote location on virtually a real time basis without any remote access hardware or software running on the Host PC. Any PC running any operating system may be accessed remotely, as long as the Host PC has a standard video card and compatible keyboard.
  • the present invention eliminates operating system dependent, software only based remote access solutions that involve costly software upgrades and complexities each time the Host or Remote PCs operating system changes.
  • KEY- VIEW II is a independent hardware unit that is installed between the Host PC and it's video monitor, keyboard, mouse and power source.
  • the Host PC's video monitor output signal passes through KEY- VIEW II before reaching the VGA monitor
  • the keyboard and mouse input signal passes through KEY- VIEW II before reaching the PC.
  • KEY- VIEW II intercepts all of the critical input and output functions of a PC necessary to totally remotely control any PC running any operating system or application.
  • the KEY- VIEW II thus provides platform-independent remote access.
  • KEY- VIEW II permits remote access to any version of any operating system, even versions that have not yet been released.
  • KEY- VIEW II converts the analog video (VGA or SVGA) output signal of a Host PC to digital form
  • KEY- VIEW II permits a remote user to on virtually a real-time basis whatever is on the video output display, even in those cases where the Host PC is totally locked up.
  • KEY- VIEW II Using KEY- VIEW II, remote support technicians can be instantly transported to a site that has failed as if they were on-site. KEY- VIEW II eliminates resulting downtime, technician travel time and permits scarce technical experts to be centralized and utilized efficiently.
  • a remote user simply calls the KEY- VIEW PC, using pcAnywhere, to take control of one or more Host PCs as if they are on site, non- intrusively, without any software or hardware installed in the Host PC(s).
  • No special hardware other than a PC or laptop with a standard modem or LAN interface card is required by a remote user to access KEY- VIEW PC.
  • KEY- VIEW II has the necessary tools to remotely restore normal Host PC processing in most cases.
  • KEY- VIEW II could be used to remotely view or change the CMOS setting on a Host PC.
  • remote repair may not be possible (e.g. a hard drive is defective)
  • KEY- VIEW II provides the necessary unrestricted access required to remotely determine what repairs (e.g. replace hard drive) will be necessary to restore normal Host PC operations.
  • Many network operating systems do not permit remote access software applications to co-exist with the network server's operating system. Even in cases where a server operating system may support remote access, many administrators don't permit remote access simply because the remote access software application degrades server performance.
  • KEY- VIEW II thus provides network administrators with unconditional access to any network server (Host PC) without requiring either CPU or Local Area Network (LAN) communications support from the Host PC or the network.
  • KEY-VLEW IL As an example of other uses for KEY-VLEW IL consider a company where each employee depends on a multi-port network communications server for remote access to their reference files. If one or more ports on the communications server should fail, remote access to the company's files and network would not be possible or would be haphazard. In such cases, simply rebooting the communications server remotely is not desirable because there may be other remote users on ports that are still operating properly, so "blindly" rebooting the communications server would immediately cut off their connection(s). Obviously, a network administrator must be in a position to take immediate corrective action, but may not be on-site. KEY-VLEW II permits administrators to remotely access and control the communications server immediately, as if they are physically sitting in front of the server.
  • KEY- VIEW II may also be used for more efficient remote maintenance of PCs. When a failure occurs, a remote maintenance center can take over the failed PC for pu ⁇ oses of running diagnostic procedures. In many cases the problem may be correctable remotely by the maintenance center, thus avoiding wasted technician travel time. At a rninimum, KEY- VIEW II provides management personnel with the information necessary to know what parts and technician skill levels are required to make the on-site repairs before anyone is dispatched to the site.
  • KEY- VIEW II may be used to remotely monitor user activities to significantly enhance co ⁇ orate security.
  • a bank could connect a KEY- VIEW PC to each PC in a remote branch. Branch staff would have no way of knowing whether or not their PC and their activities were being monitored remotely. More importantly, the monitoring process would have no effect on the staffs normal PC operations.
  • multiple PCs may be controlled remotely using a single phone line. LAN node connection or Internet Address.
  • the number of remotely accessible PCs can be increased further. Incredibly, with KEY- VIEW II full remote access is possible to remotely reboot a Host PC and watch it reboot while remaining connected to the Host PC.
  • KEY- VIEW II supports up to 256 colors and graphics resolutions up to 1024x768 and provides remote keyboard and mouse.
  • a customer installs interface cards, each having the ability to capture the VGA/SVGA video output signal of a Host PC or supported third party switch box and display the Host PC's screen on the KEY- VIEW PC's screen on virtually a real-time basis.
  • the KEY- VIEW PC also has the ability to redirect it's keyboard and mouse to control the Host PC, as if the KEY- VIEW PC's keyboard and mouse were directly connected to the Host PC.
  • a remote user links to the KEY- VIEW PC via a single copy of pcAnywhere, it serves as a gateway to totally control any "Host" PC connected to it either directly or through an optional third-party switch box.
  • KEY- VIE W II also integrates the functions of the so-called NET-911 Control Modules and KEY- VIEW PC Access Control Card into the KEY- VIEW custom hardware unit. That is, the KEY- VIEW II can be part of a unique family of NET-91 1 products. Each product in the family is designed to perform specific frmctions that further enhance the usefulness of the entire family, particularly for remote PC network administration pu ⁇ oses. The other products in the family, which are described and claimed in greater detail to follow: 1. Network Trouble Alert System. That is the most comprehensive, versatile and failsafe method for detecting network failures and issuing alerts trouble alerts to network administrators.
  • the NET-911 Trouble Alert System is a total solution solving the short-comings of existing network monitoring products.
  • the NET-911 system consists of software installed on a network workstation as well as a hardware unit connected to the workstation via a serial cable provided.
  • NET-911 monitors the environment as well as an unlimited number of file servers (for example, Novell Netware or Windows NT servers) visible to the workstation over the LAN.
  • file servers for example, Novell Netware or Windows NT servers
  • the non-serviced servers may also be monitored from the single Trouble Alert System.
  • the NET-911 System can issue pager and/or custom user recorded voice alerts over the telephone should (1) a network server fail; (2) power fail or be restored; (3) the temperature becomes too Hot or too cold; or (4) another monitored process fail (e.g. tape backup unit).
  • the hardware unit has its own redundant internal battery, microprocessor, and modem. This makes it possible to deliver alerts even when the workstation connected to the unit fails or loses AC power.
  • the workstation can be used to deliver failure alerts should the hardware unit fails.
  • NET-911 automatically cold-boots the work station to which it is connected to confirm the failure. This extra step prevents false failure alerts from being issued.
  • NET-911 records what is said when a person alerted answers an alert call and stores this recording on the workstation's disk drive. This recording serves as a perfect audit trail to prove the alert was delivered.
  • the NET-911 hardware unit also has two adapter ports that be used to optionally detect water, smoke and intruders. The NET-911 system compliments the capabilities of the
  • Control Modules These are unique devices permitting remote power control and serial access to an unlimited number of PCs or other devices, such as routers, printers, copy machines, etc. Unlike other remote power control products that require their own phone line, NET-911 modules can be chained together and connected to the serial port of any PC previously set up for remote access
  • NET-911 Control Modules permit remote power control and serial access to an unlimited number of PCs or other devices, such as routers, printers, copy machines, etc. Unlike other remote power control products that require their own phone line, NET-91 1 modules can be chained together and connected to the serial port of any PC previously set up for remote access. "Module Management Software" supplied with NET-911 modules may then be installed on this "Management PC” and remotely activated whenever necessary to control power and serial access to up to 250 devices connected to the PC's serial port. For sites using KEY- VIEW II, the modules would be connected to the serial port of the KEY- VIEW PC to provide serial access and power control to all Host PCs connected to the KEY- VIEW PC.
  • NET-911 modules may be used for numerous practical pmposes. For sites with KEY-VLEW units connected to third party supplied switch boxes, NET-911 modules may now be used to transfer files and reboot PC's connected to the switch box. For other sites, NET-911 modules may be used to serially manage and control power to other PC's or routers.
  • the Management PC may be accessed remotely using any commercially available software package, such as pcAnywhere, Remotely Possible, Carbon Copy, etc.
  • the Management PC simply serves as the gateway to individually serially access other devices, such as routers or PCs, for management, file transfer or AC power control pmposes. Most third-party, remote control, software packages will support remote access to a Management PC via the phone line, LAN and/or Internet.
  • Each NET-911 module has one "DATA IN” and one "DATA OUT” port permitting up to 250 modules to be daisy-chained together using inexpensive standard, 8 wire, straight-tl ⁇ ough, flat cable.
  • the first module on the daisy-chain connects directly from the DATA IN port to any standard serial port on a Management PC, using a special serial port interface connector (RJ-45 to DB-9) supplied.
  • Other modules may be added to the chain by connecting the DATA IN port of the module added to the DATA OUT port of the last module on the chain.
  • Modules are addressed by the NET- 911 Module Management Software (running on the Management PC) based on the order (i.e. physical sequence) that each module is installed on the daisy-chain. For example, the module directly connected to the Management PC's serial port would be Module ID 1, the module connected to module ID l's DATA OUT port would be addressed as module ED 2, and so forth.
  • each module on the daisy-chain may be individually selected (i.e. designated as the Active module).
  • the Active module When a module is active, any device connected to that module's SERIAL port may be serially- accessed, as if that device were the only serial device connected directly to the Management PC.
  • the active module may be changed at any time from a remote location using the Module Management Software.
  • a NET-911 module has one power input cord and one power output receptacle.
  • AC power input is obtained from any AC power source, such as a wall outlet or UPS.
  • AC power passes through the module to the device connected to the module's tliree prong power output receptacle.
  • Power to more than one device may be controlled by connecting any commercially available power strip having multiple receptacles to the power output receptacle on the module.
  • Each NET-911 Control Module also has a single "SERIAL interface port". This port permits a device (such as a PC, router, printer, etc. that can be controlled or managed serially) to be connected to the module using one of the RJ-45 to DB-9 serial interface adapters provided.
  • a device such as a PC, router, printer, etc. that can be controlled or managed serially
  • the module on the daisy-chain is addressed by the Management PC (using the Module Management Software provided)
  • each module on the daisy-chain may be individually selected (i.e. designated as the Active module).
  • the Active module any device connected to that module's SERIAL port may be serially accessed, as if that device were the only serial device connected directly to the Management PC.
  • the active module may be changed at any time from a remote location using the Module Management Software.
  • NET-911 modules remember the current status of output power even in cases where power fails to the module itself. This is important in an emergency situation. For example, this feature allows a user to turn OFF power permanently to devices at a remote site to prevent resulting temporary power outages from damaging the hardware at the site. In this case many devices on the market improperly reset and turn power back ON to devices at the site if power fails to their module. In contrast, NET-911 will insure power remains OFF in this example until power is turned back ON by a remote user. 3. KEY- VIEW PC Access Control Card. These cards log caller LD and restrict access to a KEY-VLEW PC based on the caller's ID. Also, they permit rebooting of the KEY- VIEW PC remotely.
  • Each KEY- VIEW PC can include a unique ISA "Access Control Card” designed to permit the KEY- VIE W PC to be remotely reset, to capture the caller's ID, issue pager alerts when intruders are detected and to control the KEY- VIEW PC's turbo light.
  • PONE OUT jack permits the pass through of the phone signal to either a telephone or a modem, as necessary.
  • the card When a call is received, the card captures the caller's ID and passes any ID received to the KEY- VIEW II application running on the KEY- VIEW PC. Using the Caller ID menu option, the KEY- VIEW PC could then be optionally configured to only accept calls from a pre-specified list of phone numbers to improve security. In addition, capturing the caller's ID permits logging the phone number of anyone attempting to remotely access the KEY- VIEW PC. Each access control card is connected either to the PC's internal reset switch or to an optional external NET-911 Control Module to permit the reset card to reboot the KEY- VIEW PC when instructed by a remote user.
  • the Access Control Card has the capability to count incoming rings and thereby permit actions based on the number of rings detected. If less and/or more than a user specified number of rings are received, the card may be configured to reboot the KEY- VIEW PC.
  • the reset card monitors all incoming phone calls and can be configured to reboot the KEY-VLEW PC in the event less a user defined number of rings are detected or more than a user defined number of rings are detected.
  • a modem is installed in the KEY- VIEW PC, it is possible that the modem answers a call but either the KEY- VIEW II and/or the remote access engine is locked up. In this case it will be necessary to remotely reboot the KEY- VIEW PC.
  • the remote access engine can be configured to instruct the modem to answer a call only after four rings. Then, the KEY- VIEW II "Enable Reboot when less than "n" rings" is set to, for example, 2 rings. Using these settings, a remote user simply calls the KEY- VIEW PC and hangs up after one ring, thereby causing the KEY-VLEW PC to reboot.
  • the Access Control Card also supports a variation of the
  • a touch tone code (up to eight digits) may be entered by a remote caller after the modem answers a call to cause the KEY- VIEW PC to reboot.
  • a modem installed in the KEY- VIEW PC could lockup and hang onto a phone line, so that the line was always busy when a remote user attempts to access the KEY- VIEW PC.
  • one remote user may wish to terminate another remote user's access during an emergency situation. Both of these situations can be resolved by connecting an external modem to the RJ-45 serial port of the Access Control card (using an optional connector and RJ-45 cable) and connecting a second (different) phone line to this modem. Any su ⁇ lus external modem may be used for this pu ⁇ ose, since this modem will never operate above 2400 baud.
  • the modem In cases where a NET-91 1 Control module is already connected to the Access Control Card's serial port, the modem should be connected to the "Data Out" port of the module. This modem would then be configured to be in an auto- answer mode. Then, the option to use an external modem must be enabled and a password defined, as discussed under the Enable Modem Reboot topic. In this situation, a remote user would simply use a terminal emulation program such as Hyperterminal (supplied with Windows) to call the external modem and enter the correct password when prompted by the access control card thereby causing the KEY- VIEW PC to reboot.
  • a terminal emulation program such as Hyperterminal (supplied with Windows) to call the external modem and enter the correct password when prompted by the access control card thereby causing the KEY- VIEW PC to reboot.
  • An Access Control Card also has the capability to issue pager alerts in the event a potential intruder is detected. Such pager alerts would be appropriate if a user fails to enter a correct password within a pre-specified number of guesses or a caller ID is detected from an unauthorized phone number.
  • the person to be alerted via their pager and the related pager codes can be defined using the Pager Alert menu option.
  • an optional external modem must be connected to the Access Control Card.
  • the Access Control Card is also used to control the turbo light on the KEY- VIEW PC's front panel via a cable connected from the card to the KEY-VLEW PC's mother board's turbo light control pins. The turbo light is then used to visually indicate when a remote user was accessing the KEY- VIEW PC and to indicate whether the KEY-VLEW PC was in Host mode or a Menu mode.
  • the KEY- VIEW PC's turbo light is OFF when the KEY- VIEW PC is in a Menu mode and is not being remotely accessed.
  • the KEY- VIEW PC's turbo light will be ON when the KEY- VIEW PC is in a Host mode and is not being remotely accessed. This light will flash ON briefly whenever the KEY-VIEW PC is in a Menu mode and is being remotely accessed. If the KEY- VIEW PC is in a mode where both pcAnywhere is "In Session" and the KEY-VIEW PC is in a Host mode, the turbo light remains ON but then flashes OFF for .5 seconds every 5 seconds.
  • the preferred embodiment of the present invention provides:
  • Remote access support for modem access, LAN Access, direct serial/parallel cable access and/or TCP IP Internet access i.e. up to 2 paths may be activated for remote access to the Host site;
  • Remote PC Refers to the PC used to call a KEY- VIEW PC to initiate a remote access session.
  • Local PC Same as Remote PC. Used in cases where narrative relates to a Remote user who would naturally view a Host PC technically as the "remote PC.”
  • KEY- VIEW PC Refers to the PC that accepts the call from the
  • Remote PC and acts as a gateway to a desired Host PC or to NET-911 Control Modules that control power and serial access to any device including PC's, Router's, etc.
  • Active Host PC Refers to the Host PC that the KEY- VIEW PC is currently controlling. Even though a KEY- VIEW PC can control multiple Host PCs either via (1) an external PC switch box connected to a KEY-VLEW PCI card or (2) multiple PCI cards, only one of these PC's can be controlled at any point in time. That PC which is currently being controlled is referred to as the "active PC." Active PCI Card Since multiple PCI cards can be installed in a
  • the active PCI card refers to the PCI card that is currently selected for access by the KEY- VIEW APP.
  • KEY- VIEW Unit The first generation custom designed KEY- VLEW hardware device (i.e., black box) that permitted remote access to a Host site. This KEY- VIEW unit is now being replaced with the KEY-VLEW PC.
  • Host PC Refers to any PC that can be controlled by the KEY- VIEW PC.
  • KEY- VIEW APP The software ninning under the KEY- VIEW
  • the BOOT APP will further permit serial pass-through access by the KEY- VIEW PC to each boot module. Finally, this APP permits resetting the KEY- VIEW PC via an interface from the "PHONE" RJ-11 connector to a phone line based on either the number of rings or based on touch tone pressed after the KEY- VIEW modem answers a call.
  • KB/MOUSE APP The KEY-VLEW PCI Card will have a separate keyboard/mouse microprocessor (APP) that will accept input from the PCI APP representing user key presses, mouse pointer X/Y position on the screen and mouse button press/releases received from the KEY- VIEW APP.
  • the KB/MOUSE APP will process this information and provide the necessary keyboard mouse interface to the active Host PC. In certain cases this KB/MOUSE APP will communicate information back to the KEY-VLEW APP (via the PCI APP). For example if the active KEY-VLEW PCI card is connected to a switch box, the switch box will normally return status information to the
  • KB/MOUSE APP whenever a switch occurs to a new PC connected to the switch box. This information would then be passed from the KB/MOUSE APP back to the KEY- VIEW APP so user switching between Host PCs can be confirmed. Variations of the above terms may be used, such as 'Remote Mouse' to refer to the mouse connected to the Remote PC, 'Remote User' to refer to the person operating the Remote PC, "Remote site" to refer to the site where the Remote PC is located, etc.
  • FIGURE 1 is a schematic block diagram of an example PCI card in accordance with the present invention.
  • FIGURE 2 is a schematic block diagram of the video interface example embodiment of the present invention.
  • FIGURE 3 is schematic block diagram of the main CPU interface in accordance with an example embodiment of the present invention.
  • FIGURE 4 is a main CPU memory map in accordance with an example embodiment of the present invention
  • FIGURE 5 is a flash pallette converter circuit in accordance with an example embodiment of the present invention
  • FIGURE 6 is a flash pallette converter circuit timing diagram in accordance with an example embodiment of the present invention.
  • FIGURE 7 is a schematic representation of pixel assembly in accordance with an example embodiment of the present invention.
  • FIGURE 8 is a schematic block diagram of an example embodiment of the pixel assembly circuit
  • FIGURE 9 is a detailed schematic diagram of an example embodiment of the PCI card in accordance with the present invention.
  • FIGURE 10 is an example embodiment of daisy-chained control modules in accordance with an example embodiment of the present invention.
  • FIGURE 11 is an example embodiment of an access control card in accordance with an example embodiment of the present invention.
  • FIGURE 12 is a combination schematic and perspective view of an example embodiment of the present invention including a remote access PC, control module, and modem;
  • FIGURES 13 through 27 are example graphical user interfaces in accordance with example embodiments of the present invention.
  • FIGURE 28 is a schematic diagram of an example embodiment of the present system configuration.
  • FIGURE 29 is another example embodiment of present system configuration.
  • the KEY- VIEW II Host Site consists of a KEY-VIEW PC connected to one or more Host PCs.
  • a remote user can access an unlimited number of KEY- VIE W II Host sites using the remote access engine (preferably pcAnv vhere).
  • KEY- VIEW II is independent of the type of operating system running on the Host PC, since there is no KEY- VIEW II software running on the Host PC
  • a typical preferred KEY-VIEW II PC has 4 PCI and 4 ISA slots and includes the following hardware components: IBM Compatible keyboard Microsoft Compatible serial mouse SVGA Monitor
  • PC results in the fastest screen refresh rates and is the preferred remote access approach.
  • a modem is typically used as a backup means to assure failsafe access to a KEY- VIEW II Host site in an emergency situation.
  • Each KEY- VIEW II PCI card may be connected to either a
  • switch box If a switch box is connected to the PCI card, the switch box must permit keyboard controlled switching between PCs connected to the switch box and deliver a consistent, high quality- video signal to the PCI cards video input port.
  • Most high end commercially available KVM switch boxes supplied by companies such as Cybex meet this criteria.
  • switch boxes are cascaded to one KEY-VLEW II.
  • the video switch box used with the KEY- VIEW II employs switching between PCs accomplished using a standard IBM compatible keyboard connected to the switch box. The quality and stability of the switch box video output signal should be sufficient for KEY- VIEW PCI card to capture a clear, consistent video signal from the active Host PC.
  • the KEY-VLEW PC includes three application software packages, namely pcAnywhere, NET-911 Control Module system and the KEY- VIEW II system. Preferably, no other software applications are installed or operated from the KEY- VIEW PC.
  • a KEY- VIEW PC must be equipped with at least one means for remote access. It is recommended that two access modes be installed in case one of the means for remote access has failed.
  • LAN access is then normally used as the preferred means for remote access because of the significantly faster response times. In the event the LAN fails then the remote access could occur via a modem or Internet connection.
  • the Possible means for remote access to the KEY- VIEW II PC are as follows:
  • the PCI slots are reserved for the KEY- VIEW II cards even if 4 cards are not initially installed in the system. Often users find they want to install additional KEY- VIEW PCI cards. Reserving the PCI slots for this purpose avoids the need to reconfigure the operating system if other PCI feature cards need to be changed to ISA cards.
  • Each KEY-VLEW PCI card has the necessary Host PC VGA/
  • PCI cards may be inserted into the KEY- VIEW PC so that a single KEY- VIEW PC could control one or more Host PCs or PC switch boxes.
  • PCI cards share the same addresses and IRQs.
  • Each PCI card contains a 3 position DIP switch necessary to set the card ID from 0-7.
  • each PCI card could optionally be connected to a supported switch box, which in turn may be connected to multiple PCs.
  • a supported switch box can be remotely instructed to switch between Host PCs and pass the selected Host PC's keyboard, mouse, serial and video interfaces to the KEY- VIEW PCs PCI card.
  • a switch box could be connected to 3 PCs where PC (1) is running a DOS text mode, PC (2) is running a 640x480 graphics mode and PC (3) is running a 1024x768 graphics mode.
  • a remote user could click a menu option on the KEY- VIEW PC's screen to tell the switch box (via special keyboard key sequences) to switch from PC (2) to PC (3).
  • Special unique KEY- VIEW II software interfaces to the operating system insures the KEY- VIEW PC automatically adjusts to different graphics modes on the fly, so that the KEY- VIEW PC's screen always mirrors the contents of a Host PC's screen on a full-screen basis.
  • Each KEY- VIEW PC also requires one ISA KEY- VIEW Access Control Card.
  • This card permits a remote user to reboot (via the Reset button's circuit) the KEY- VIEW PC in event the KEY- VIEW PC should ever lock up.
  • An RJ-45 interface port is on this card that could be connected to an optional NET-91 1 Control Module to further permit cold booting (i.e. cutting AC power) to the KEY- VIEW PC from a remote location.
  • this card may be used to control one of the status lights (normally the turbo light) on the front of the KEY-VLEW PC so that personnel at a Host site have a visible indication whenever someone is remotely accessing the KEY- VIEW PC (i.e.
  • any calls to a modem in the KEY-VLEW PC must first pass through the phone line interface IN/OUT ports on this card.
  • This approach permits the card to capture the caller's ED (i.e. telephone number) from the phone line.
  • the card could limit any remote user's modem access to the KEY-VLEW PC's as well as a remote user's KEY-VLEW PC reboot options based on the caller's ID. Accordingly, this call ID information can serve to increase the level of security and remote access to the KEY- VIEW PC.
  • One of the standard serial ports of the KEY- VIEW PC is normally used to provide a serial interface to up to 250 NET-911 Control Modules. These modules may be daisy-chained together to permit a remote user to cold boot Host PCs or any other devices at a Host site. In addition, the modules also permit a remote user to serially access the device connected to the module, as if that that device were the only device directly connected to the Host PC's serial port.
  • KEY- VIEW II PCI hardware card and its internal circuit interactions are described.
  • the chief parts of the Key View II card are the FPGAs (Field Programmable Gate Arrays) and the on-board CPUs.
  • the card has three main functions : the video capture circuit, the keyboard/mouse circuit, and the serial port circuit.
  • the card is designed to interface with a PCI bus architecture.
  • the card is primarily designed around two FPGAs, preferably, of the Xilinx XC3100 A family, which operate over 80 MHz.
  • the other is the main FPGA and is a standard Xilinx part.
  • the FPGA 11 is surrounded by several different circuits. These include the video interface circuitry 14, the serial controller chip circuitry 15, mouse and keyboard driver circuits 17 and 18, the keyboard and main card CPU circuits 20 and 21, the dock 19, the flash palette converter RAM 24, the video capture RAM 25 and 26, and the PCI bus controller chip 22 communicating with PCI Bus 23.
  • Card ID switch 16 is also included.
  • FIG. 2 illustrates the video interface circuitry 14 to the FPGA 11.
  • Three sets of video buffer circuits 29-31 contain video amplifiers that boost the video and send it back out to the VGA display. These circuits 29-31 also provide noise and level conditioning to accommodate the ADCs 32-34, which expect the analog signals to be within the bounds of known voltages.
  • the analog color signals drive three Analog Devices AD9012 flash analog to digital converters 32-34. These circuits convert the input voltage to an output 8 bit digital value using flash conversion technology whereby the reference signal is divided by an internal resistor voltage ladder into 256 individual steps. These voltage steps are simultaneously compared to the input signal by 256 separate analog comparators. By comparing all possible values at once, the chip can operate at up to 100 MHz.
  • the ADC chips output 8 bits the PCI card requires only 5 bits for each color. Thus, the 3 least significant bits are discarded yielding 15 address bits.
  • the combination of the Flash Palette Converter RAM discussed below and the process of discarding the three least significant bits of the video signal make the captured video extremely stable.
  • the sync pulses, Hsync and Vsync, from the video signal are conditioned and fed into the main FPGA 11. Both of these signals are polarity coded so that older momtors (non-multisync) will know what mode the VGA card was sending. This means that the signals might either be negative or positive pulses. Since TTL level signals are needed for the FPGA, these random polarity signals must be converted to positive TTL level signals. But before that is done, the polarity itself needs to be converted to a TTL level signal and also fed into the FPGA. Therefore, the sync conditioning circuits 35 and 37 will output four TTL lines - two sync pulses and two polarity pulses.
  • the FPGA will latch the polarity pulses internally to form two stable polarity bits (see FPGA registers).
  • the FPGA also does some additional processing of the video sync pulses. Because the software needs to know the exact video frame rate, the FPGA has a small frequency counter that counts the number of Vsync pulses in a second and stores that value in an FPGA register. Another FPGA counter counts the number of Hsync pulses in between Vsync pulses. This value is also stored in another FPGA register.
  • the Hsync pulse is fed to conditioner 36 and PLL 38.
  • Some video cards will blank this signal after the end of active video. For physical monitors, this is not a problem; however, for PLL circuits, it can cause the output frequency to drift. Most PLL circuits require a stable reference frequency or else they will become unstable. Some PLL chips, such as 1C51522 PLL chip, have the necessary circuitry to ignore the missing Hsync pulses.
  • the output of the PLL becomes the dot clock for the video. Each pulse from this dot clock should line up exactly with the center of each dot on the video signal. Therefore, the PLL includes a method for adjusting the phase of the output dot clock and for supporting the various number of video line lengths, i.e. 640, 800, 1024, etc.
  • the Keyview PCI card uses two separate CPUs for embedded processing, the main CPU 21 and keyboard CPU 20.
  • the keyboard CPU interface has no external memory so most of its I/O pins are free to do other things.
  • Two ports of the keyboard CPU are used to control the two mice and the keyboard and the other ports 0 and 2 are used to communicate with the main CPU and serial EEPROM.
  • the interface of the main CPU 21 to the card includes external program RAM memory 41 holding some program code for the microprocessors.
  • the instruction fetch and data read write signals from the CPU are merged by logic in the FPGA to allow the CPU to execute code from the RAM.
  • the RAM is mapped to the last 32K of the CPU's address space. This guarantees that the bootstrap program that is in the EPROM inside the CPU will receive control on reset before the RAM does. Using software techniques, the actual program is loaded into the RAM by the bootstrap program. With this done, control is transferred to the program in the RAM after IPL.
  • the main CPU 21 is also capable of addressing the FPGA registers 11 and both of the Dual Port Flash Palette Converter RAMs 24A and 24B. These are all mapped into the first 32K of the data storage space of the main CPU. This is possible since the CPU treats data memory differently than program memory. To prevent conflicts between the FPGA registers and the Flash Palette
  • Converter RAMs (which are all mapped to the same location and bank), two special device select bits are output directly from the main CPU. These I/O lines select the device that will be addressed when the CPU accesses the lower 32K of its data memory address space.
  • the main card CPU 21 has a watchdog feature that will reset the CPU if it does not respond to it within a certain amount of time.
  • the keyboard CPU 20 does not have any such automatic circuitry. Instead, the reset line to the keyboard circuit is controlled by the main card CPU directly. This keeps the main CPU from locking up indefinitely.
  • the address latch is, in practice, usually an external 74L5373 or equivalent. Because the inputs to this chip are needed by the FPGA 11 to access the FPGA registers, this latch function is implemented in the FPGA.
  • the ALE is input to the FPGA latch strobe and, in response, the Q outputs of the latch are output. Using this configuration, up to 256 individual registers may be addressed inside the FPGA.
  • the CPUs are two 87C52-24 microprocessors running parallel in a master/slave arrangement from the main and keyboard CPUs 20 and 21. They will both run from the same 22.1184 Mhz clock supplied by the keyboard circuit.
  • the main card CPU 21 sends commands and data to the keyboard CPU in a serial fashion.
  • the keyboard CPU 20 will have a program that simply sends codes to the keyboard and mouse as it is told to do so by the main CPU 21.
  • the main card CPU 21 has bootstrap code which controls its IPL.
  • the main program is housed in RAM and has a jump table at a fixed address so that whatever program is running will know how to call the library functions.
  • the inter-CPU communication routines can be shared between the keyboard CPU program segment and the main card CPU program segment.
  • the main memory map is shown in Figure 4. Rather than keeping the RAM (data) and ROM (code) address spaces separate, in this design, a RAM program storage area is needed to facilitate program uploading, meaning that the RAM chip is mapped to both the RAM and the ROM areas of the upper 32K of each address space.
  • a bootstrap program is burned into the internal EPROM 45. It is 8K in length and is mapped starting at ROM address OQOQH and cannot be accessed using RAM reads. On power up, the bootstrap code will have control.
  • the KV-APP will load the main card CPU's RAM with it's program, called an LPL (Initial Program Load).
  • the RAM is mapped to 000H-FFFFH in both RAM and ROM address spaces 46 of the main card CPU.
  • the RAM is a 32Kx8 1 5ns chip or better.
  • the program in the keyboard CPU is fixed and cannot be overwritten by the KV-APP.
  • the CPU's can be mask programmed, OTP programmed, or EPROM programmed. It is important that the security bits on the CPU not be set in a way that would prevent external code from executing.
  • an Intel 87C52BH series microprocessor may be used. It is highly likely that both the keyboard and the main card IPL code will be combined into the same EPROM program space.
  • the CPU would determine if there is any external RAM attached to it. If so, the device will run the main card CPU code. If not, the device will assume the personality of the keyboard CPU.
  • the keyboard process is allocated 25% of the total EPROM space and the main process is allocated 75%. In the currently selected 87C52-24 chip there is 8K of EPROM which translates to 2K for the keyboard process and 6K for the main process.
  • the KV-APP will instruct the main card CPU to begin executing the RAM program.
  • the RAM program contains extra code and functionality that the bootstrap program does not.
  • the serial I O pins, RxD (data) and TxD (clock) of the main card CPU 21 communicate serially with its peripheral devices.
  • the serial lines (Clock, Data, and RD/WR [PI .0]) are bussed to all the serial devices.
  • the CPU 21 also outputs individual device select lines for each device.
  • the serial devices ignore their inputs (clock, data, and RD/WR) until they receive a high level on their device select (CS) input. No device is allowed to output any signal until it is selected and must change all of it's outputs to a high impedance state when it is not selected.
  • the PLL 38 is a special case. With it, the RD/WR pin is not used, and the Read Write function is inco ⁇ orated into the data stream. No serial device will ever initiate any communication with the main card CPU, not even if it is selected by the device select lines.
  • the keyboard CPU has a private EEPROM chip attached to it so the keyboard circuit can access the EEPROM data while the remainder of the circuit is powered down. 766
  • the keyboard CPU must be accessed serially. It does not have any registers that are directly accessible, but uses a command approach instead. With this approach, the number of bytes to and from the device are variable depending on which command is executed. The first byte that is written to the keyboard CPU is the COMMAND byte.
  • Some example commands include:
  • CODE COMMAND Action 00000000 NOP No Operation 01000000 RESET Reset the keyboard CPU error flag 00000100 QUERY STATUS Copy the status register to the output register 01000100 READ FIFO Copy the top FLFO byte to the output register 00000001 MOUSE TYPE Change the mouse hardware type (next byte) 01000001 SEND KEY Send a byte to the keyboard (next byte) 10000001 SEND MOUSE Send a byte to the mouse (next byte) 111 11101 READ PROM Move an EEPROM byte to the output register 111 11000 ENABLE WRITE Enable a WRITE PROM as next command 111 11010 WRITE PROM Writes a bvte to the EEPROM
  • All read operations on the keyboard CPU 20 will read the contents of the CPU 20 output register. This register is set by certain commands and may be read multiple times without affecting its contents.
  • the lower three bits of the keyboard command codes have a special meaning.
  • the two LSBs (bits 1 and 0) always indicate the number of bytes that will follow the command byte. This configuration allows for up to three bytes to follow the command byte. If bit 2 is set, then the command will alter the contents of the keyboard CPU's output register. The remaining bits are arbitrary and serve only to make each command unique.
  • the WRITE ENABLE condition is voided. Any attempt to send a WRITE PROM command without first sending a WRITE ENABLE command will cause the keyboard CPU to ignore the WRITE PROM command and set the appropriate error flag in the keyboard status register. The requirement of a preceding WRITE ENABLE command before a WRITE PROM command will help prevent inadvertent EEPROM writes by confused microprocessors.
  • the keyboard CPU software resets the serial interface so that if the last byte was sent in error, it will be cleared.
  • the keyboard CPU is written to when the RD/WR' pin is low and read when the RD/WR' pin is high.
  • the status register that is returned for a QUERY STATUS command has the following definitions:
  • Bit 0 Num-Lock light status — Light status from host.
  • Bit 1 Scroll-Lock Light status — Light status from host.
  • Bit 2 Caps-lock light status — Light status from host.
  • Bit 3 Host Power On
  • Bit 4 EEPROM is busy.
  • Bit 5 Error - Attempt to write to protected memory.
  • Bit 6 Error - An error was detected in communication.
  • Bit 7 FIFO overrun - FIFO has lost bytes because it has not been read.
  • the main CPU 21 has several I/O pins that are dedicated to communication with the keyboard CPU 20.
  • One I/O pin is a special BUSY input pin that is fed directly by the keyboard CPU. This indicates to the main card CPU that the keyboard CPU is busy with 766
  • a third input I/O pin on the main CPU is fed by the keyboard's RTS (Ready To Send) output. This output tells the main CPU that the keyboard's internal FIFO has something in it and that it needs to be serviced.
  • a handshaking approach is used.
  • the main CPU wants to send a byte to the keyboard CPU, it first checks the BUSY input from the keyboard CPU to make sure that it is low. If it is high, the main CPU must wait for it to clear. If the main CPU has to wait longer than one second, it will assume that the keyboard CPU has crashed and will reset it by toggling the RST pin on the keyboard CPU. Otherwise, with the BUSY input low, the main CPU can begin transferring a serial byte.
  • the BUSY flag also indicates to the main CPU that the keyboard CPU has finished processing a serial input bit. This status is triggered by the device select input. Therefore it is important to read the BUSY pin before selecting the keyboard CPU.
  • the main CPU 21 Before the main CPU 21 sends the first bit, it first sets the serial clock and RD/WR' lines low and sets the keyboard device select line high. It then outputs the data bit on the serial data line. With this done, it changes the level of the clock output to high.
  • the keyboard CPU sees a low to high transition on the serial clock line, it reads the bit on the serial data line. Then, when the keyboard CPU 20 has finished processing the bit, it pulls its BUSY output high. This tells the main CPU that the bit was received and processed.
  • the main CPU then pulls the serial clock back low which signals the keyboard CPU to do the same with it's BUSY output. This process continues until all eight bits of the byte are transferred from the main CPU to the keyboard CPU. When all of the command bytes have been transferred, the device select line is cleared and the keyboard BUSY output returns to normal use. This procedure enables the keyboard CPU to detect serial framing errors while maintaining a high data transfer rate.
  • a similar process takes place when the main CPU reads a serial byte from the keyboard CPU's output register. First, after verifying that the keyboard CPU is not busy or crashed, the main CPU sets the clock line low and the RD/WR' and device select lines high. This time, when the main CPU pulls the clock line high, the keyboard CPU will output a bit on the serial data line.
  • the keyboard CPU then pulls it's BUSY output high. This tells the main CPU that the data is ready to be read. When the main CPU has read and finished processing the input bit, it pulls the serial clock line back low. The keyboard CPU sees this and does the same with its BUSY output. Again, the process continues until the entire byte is sent from the keyboard CPU to the mam CPU. Since there is only one byte to read, the device select line is reset. Keyboard Command Procedure
  • Typical keyboard operation for sending scan codes to the host is for the main card CPU to issue the following commands to the keyboard CPU:
  • the keyboard CPU Upon receiving the scan code byte, the keyboard CPU temporarily sets its BUSY pin and sends the byte verbatim to the host.
  • the ERROR flag in the status register is set if the keyboard CPU is asked to process a command that is not valid. This error detection applies only to keyboard CPU commands and not to scan code data.
  • switch box will return invalid scan codes as a form of communication. These are added to a 16 byte software FIFO inside the keyboard CPU upon receipt. This FLFO is actually implemented as a circular queue. Since the switch boxes would normally never send more than 4 bytes in response to a key sequence, there is only a remote possibility that the 16 byte FIFO would be overrun before it could be serviced by the main card CPU. The sequence would be something like this (for a [NUMLOCK] [MINUS] [NUMLOCK] key sequence):
  • the PLL 38 video dot clock chip requires special serial access.
  • One main difference is that the RD/WR' pin for all the other devices is not used.
  • the PLL gets this bit via the data stream.
  • the device select output from the main CPU is connected to the SELn input pin of the PLL chip.
  • the PLL 38 uses a RD/WR bit, followed by a three bit address, followed by an eleven bit data byte.
  • a 4-wire serial EEPROM is provided on the card for non- volatile data storage.
  • An example design calls for a 2K serial EEPROM organized as 256 x 8 bytes.
  • the EEPROM stores the External Serial Port IRQ and Base addresses when the Key View computer is powered down.
  • the EEPROM is local to the keyboard CPU 20 and be powered by the dual power supply of the keyboard circuit.
  • the main card CPU 21 can access the information in the EEPROM by querying the keyboard CPU.
  • the EEPROM is not on the serial bus and the main CPU cannot access it directly.
  • the watchdog timer circuit for the main CPU 21 is inco ⁇ orated into the main CPU IC.
  • the keyboard CPU 20 has a software driven watchdog circuit built into the main CPU. If the keyboard does not respond to a command that the main CPU sends it within a finite amount of time, then the main CPU will toggle the keyboard CPU's RST line. This will cause the keyboard CPU to reset.
  • Both CPUs have special circuitry to enable power up reset and other circuitry to prevent inadvertent resets of the keyboard CPU when the main CPU is not powered up.
  • the main FPGA which is the only one that contains registers, is mapped into the main card CPU's RAM space ( Figure 4).
  • the first 256 bytes of RAM space 47 (OOH to FFH) correspond exactly to the FPGA register space. It is important that the FPGA device select be set high for all FPGA register accesses. If not, CPU accesses to RAM locations in the OOOOH to 7FFFH region will be mapped to the Flash Palette Converter RAM. However, when the FPGA device select bit is set high, the contents of the FPGA registers can be read from and written to directly.
  • the main CPU 21 has eight identified Port 1 connections (P1.0-P1.7) shown in Figure 3, and discussed as follows:
  • the PI .0 - RD/WR' Se ⁇ al Bus Read/Write Output port outputs to the keyboard CPU 20. This output pin acts as a
  • RD/WR' signal during mode serial bus accesses.
  • the pin is normally high (read) and will be set low when writing data to a serial device. For most devices, including the EEPROM and keyboard chips, the operation of this pin is as described. However, for the PLL 38, this pin is not connected.
  • the Pl .l - FPGA Device Select Output connects to the FPGA 11 and serves as the chip select line for the lower 32K of the main CPU's RAM data address space.
  • This pin is high and the main CPU makes a data read or write to the OOH to FFH address space, it will actually be reading or writing FPGA registers directly.
  • this pin is low and the main CPU addresses data in the OOOOH to 7FFFH region, it will actually be addressing data in the Flash Palette Converter RAM.
  • the CPU 20 is a special dedicated pin that indicates that the keyboard CPU is busy and cannot respond to serial commands. This input also has a dual pu ⁇ ose and is also used as a timing signal during serial transfers between the main CPU and the keyboard CPU.
  • the PI .3 - Keyboard Reset Output pin is connected directly
  • the main CPU (almost) to the RST (reset) input of the keyboard CPU 20. It is used by the main CPU to reset the keyboard CPU when a crash is detected. The main CPU can also toggle this bit under command from the PCI APP. To help prevent inadvertent resets of the keyboard CPU, FPGA logic will require that the keyboard CPU be selected by the FPGA chip select register before the reset signal will get through.
  • the P1.4 - FIFO RTS Input connects to the keyboard CPU 20 and is the FIFO Ready to Send strobe. It's pii ⁇ ose is to indicate when the FIFO in the keyboard chip has at least one byte in it. It will clear when the last byte is read from the FIFO.
  • the PI .5 - ICS1 522 Device Select is the I/O pin that controls the SELn pin on the PLL dot clock 38. The device is selected when this pin goes low. When the device is selected, it may write to the serial bus.
  • the PI.6 - Keyboard Device Select is the I/O pin that controls the Device Select input to the keyboard CPU. The keyboard CPU is selected when this pin is high. When the keyboard is selected, it may read or write data on the serial bus.
  • the PI .7 - Flash Palette Converter Chip Select connects to the FPGA 11 and controls which one of the dual port flash palette converter RAMs are accessed during CPU reads and writes. If this pin is high, then the odd bank is selected. Otherwise, the even bank is selected.
  • Main FPGA register index The design may include several FPGAs 11 from a hardware standpoint, even though from the software standpoint, all of the registers are in a single FPGA.
  • a second FPGA needs register information it will be necessary for it to have a hardware connection to the first FPGA in order to gain access to the registers.
  • the registers are addressed directly by the main CPU 21 and there can be potentially up to 256 registers in each FPGA. Before the main CPU can address any of these registers it must first output a high level on the FPGA Device Select output pin Pl .l . This enables the FPGA registers and disables the Flash Palette Converter RAM.
  • some registers include:
  • This byte is a read only flag that contains the four bits selected by the dip switch. Bits 0 and 1 are used as a card address. Bits 2 and 3 are reserved. The flags in this register are:
  • This bit determines which video bank 25 and 26 is connected to which circuit.
  • a high bit means that the FPGA 13 has bank 0 (25) and the bus 23 has bank 1 (26).
  • this pin would be tied to address line A14 of the left (capture) port of the RAM.
  • the same address line on the right (PCI bus) port is tied to the inverse of this bit. This way, while one circuit has total access to the 0-8K section of the
  • This register is a command register with the lower 5 bits being the instruction to execute.
  • the FPGA When this register is written to by the KV-APP, the FPGA generates an interrupt to the main card CPU by toggling its INTl pin. The main card CPU can then begin processing this command.
  • all the bits in the status register of the FPGA are set to their appropriate values. This action is performed automatically by the FPGA itself and not by the main CPU for performance reasons.
  • the command byte is organized as follows:
  • the parameter port registers are generally parameters of commands that are sent to the Command Register.
  • Busy Parameter Port 1 The card is busy transfe ⁇ ing a byte from or to FPGA parameter port 1. This bit is automatically set by the FPGA when the KVAPP writes or reads a parameter to Parameter Port 1 (base + 2 I/O register) in the FPGA. The main card CPU resets this bit when it is finished processing or is ready for the next byte to be transferred.
  • 3 - Busy Parameter Port 2 The card is busy transferring a byte from or to FPGA parameter port 2. This bit is automatically set by the FPGA when the KV-APP writes or reads a parameter to Parameter Port 2 (base + 3 I/O register) in the FPGA.
  • the main card CPU resets this bit when it is finished processing or is ready for the next byte to be transfened.
  • 4 - Mode Change This flag is set when a video mode change is detected by the main card CPU. This flag is normally reset when the card receives a "Load Video Parameters" command. 5 - Reserved 6 - Reserved
  • 11 Main card I/O base address MSB - high byte of the I/O base address. This is the I/O address that the KV-APP uses when it sends and receives data to and from the KeyView II card. Specifically, it is the I/O address of the Command Port register. The Parameter Port registers are accessed by adding an appropriate offset to this address (i.e.- base + 1, base + 2, and base + 3). The PCI circuitry on the Key View card will map the command port base register to this I/O address. This is not the serial port base address. It is defined by another FPGA register. 12 - Main card I/O base address LSB - low byte of the I/O base address. See above for details.
  • the PCI circuitry on the KeyView card will map the serial port base register to this I/O address.
  • Serial port IRQ The IRQ of the serial port. This is the IRQ that the serial port uses to interrupt the operating system.
  • the PCI circuitry on the KeyView II card uses this register to initiate an IRQ interrupt.
  • Video Timing Register - "START SEGMENT” - The number of lines, or Hsyncs, including invisible lines after the Vsync and before the first line of captured video. This includes all of the uncaptured active video lines that are before the first horizontal line to be captured. This is the exact physical line on which segment capture begins.
  • Video Timing Register "START LINE" - The number of invisible pixels, or dot clocks, after the Hsync pulse and before the first active video pixel on all active lines. This is the exact physical pixel on which to start the video line capture. This register is exported to the video FPGA.
  • 21 - Video Timing Register - "END LINE” The number of pixels, or dot clocks, after the Hsync pulse, including invisible pixels as well as all active pixels. This is the exact physical pixel on which to stop the video line capture. This register is exported to the video FPGA. 22 - Video Timing Register - "STOP SEGMENT” - The number of lines, or Hsyncs, including both invisible lines as well as captured lines before the last active line of video to capture. This is the exact physical line on which segment capture ends. 23 - Chip Select Register - This register is not used.
  • 25 The LSB of the MSW of the 32 bit checksum for the cu ⁇ ent video bank.
  • 26 The MSB of the LSW of the 32 bit checksum for the cu ⁇ ent video bank.
  • the checksum register is cleared. The checksum is continually written to this register when the video scanning beam is in the selected segment. When the video scanning beam exits the selected segment, the value in the checksum register is valid for that segment. If this value is not promptly read, it will become corrupted if the next frame overwrites it. Also, at the end of the captured segment, the FPGA generates an interrupt to the main card CPU by toggling the LNTO pin. These registers are imported from the video FPGA. 28 - Vertical Frame Rate - The FPGA has a frequency counter circuit that continually counts the number of Vsync Pulses in one second. This count is stored in this register as a total and not as an active count.
  • the FPGA has another special 16 bit counter that counts the number of Hsync pulses in between Vsync pulses. This register is the upper byte of that 16 bit count.
  • Initialization To send a command to the KV-CARD 10, it must first be initialized. When the card is powered up, it is in stealth mode and does not contain much of the program needed to implement the commands presented here. The main card CPU program must be loaded, but before that, the I O port and video segment address must be loaded first. At power up, the card 10 does not contain any knowledge of which I/O base address is supposed to actually be the command port. Without the I/O base address, there is no way for it to receive commands from the KV-APP. To get around this, a small self- training procedure has been developed. In this procedure, the KV- APP selects one I/O base address out of a possible 8 that the card will be using.
  • NOP code 00
  • card 0 It will then send a NOP (code 00) addressed to card 0 to this address repeatedly. These NOP's are sent in 1/10th second intervals for up to ten seconds. If the card is present, it will latch on to the I/O base address and decloak. This function is part of the software and not the FPGA. All cards are in stealth mode during this phase of the initialization or else bus conflicts will occur.
  • the KV-APP then confirms the card's presence by reading the command/ status register and the three parameter ports. Decloaking is not the normal operation for the NOP command and should not be used to tell the card to decloak.
  • the NOP command simply does nothing except clear the status register to zero.
  • the KV-APP then repeats the procedure for all four PCI cards in the Keyview PC. Before proceeding to the next card, the decloaked card is put back into stealth mode
  • the KV-APP detects this and writes the second byte of the packet to this port. With that done, the KV-APP waits until the busy flag is clear again. It then sends the next byte, and so on, until all 256 bytes have been transfened. The 8 bit checksum is then sent as the 257th byte. At that time, the main card CPU compares the checksum with the actual checksum of the received packet. If the two are different, the CPU reports this by setting the ERROR flag in the status register. On error, the contents of the temporary buffer are discarded.
  • the contents of the temporary buffer is copied to the device or location that was initially referenced by the value written to parameter port 0 and at the address specified in parameter port 1.
  • the BUSY flag for the command register remains set until the packet transfer is complete. All command and parameter port busy flags are cleared when the packet operation is complete.
  • the 'chunk' (packet) number that was loaded into parameter port 1 is only used when transferring data to and from the CPU RAM 41 and the flash palette converter RAMs 24 A and 24B. With single packet transfers, the high bit is still important, and the packet number should be set to zero.
  • the checksum is valid for all transfers. It should also be noted that if any other command is written to the command register during a packet transfer, even a NOP, the entire packet is discarded.
  • each 256 byte packet is sent separately as a separate command. In these cases, it is important to specify which 256 byte packet is being transfened. Only one of 128 packets (32K) may be specified in parameter port 1 to any given device. These packets do not have to be in sequential order.
  • the main card CPU places the second byte of the packet in parameter port 2 and clears its busy flag.
  • the KV-APP then reads and stores that byte also. This process continues until all 256 bytes have been read by the KV-APP. At that time, the main card CPU transfers a 257th byte which is the checksum.
  • the KVAPP always makes a point of reading the checksum byte even if it does not use it.
  • the BUSY flag for the command register remains set until the packet transfer is complete. All command and parameter port busy flags are cleared when the packet operation is complete.
  • the packet number that was loaded into parameter port 1 is only used when transferring data to and from a RAM device. For all other devices, this is set to zero. The checksum is valid for all transfers. If any other command is written to the command register during a packet transfer, even a NOP, the packet transfer is terminated and may leave the KV-APP in an unspecified state.
  • each 256 byte packet is sent separately as a separate command. In these cases, it is important to specify which 256 byte packet is being transfened. Only one of 128 packets (32K total) may be specified for any given device. These packets do not have to be in sequential order.
  • KeyView II Card Commands The following is a list of the commands and their parameters that the KV-CARD will accept:
  • This command has the effect of clearing the busy and e ⁇ or flags in the status register.
  • the busy flags are always cleared when the command completes. Since a NOP doesn't do anything in particular, it is always complete and thus clears all four busy flags.
  • the first 6 bits of the command byte are all zero and the last two, bits 6 and 7, are for card addressing. Only the card that is actually addressed will process the NOP instruction. This is regardless of whether or not the card was in stealth mode.
  • This command allows 256 byte packets to be transfened to and from the KV-APP.
  • the device or buffer that the data comes from or goes into is specified by the DEVICE parameter which is loaded into Parameter port 0 before calling this command.
  • the address of the packet in the card device can be specified in cases where there are multiple packets. This includes the mam card CPU program and the flash palette converter RAM contents.
  • the address byte is stored in Parameter port 1. It is actually only 7 bits so that the range of values for the address is limited to 0 to 127. Since this is actually an index to 256 byte pages, it can actually address from 0 to 32,768.
  • the CPU RAM is addressed relative to the beginning of the device and not to the actual CPU address.
  • Bit 7 of the address byte controls this. If bit 7 it set, the operation is a packet WRITE to the card. If bit 7 is clear, the operation is a packet READ from the card.
  • Parameter port 2 is where all the data is read or written to. The 256 bytes are transfened sequentially until all have been sent. After this, an additional one byte checksum is also sent.
  • This device is for storing a 256 bvte structure of video parameters into the card. This is a quick and simple way to ensure that all the video registers are loaded when a video mode change occurs.
  • 05 - Keyboard/Mouse Setup Record This is a 256 byte structure of keyboard and mouse setup info ⁇ nation. This record contains information about the type of mouse and keyboard that are connected to the card.
  • 06 - Checksum Registers This is the entire 64 DWORD (256 byte) checksum anay. Individual registers may be read using the Video Checksum Manager. The Transfer command also allows the checksum registers to be written.
  • This command causes the Main Card CPU to mathematically generate a unifo ⁇ n palette and load it into the flash palette converter RAM.
  • the actual palette generated depends on the contents of parameter ports 0 and 1. If parameter port 0 is zero, the palette will be Black & White Greyscale. If there is any other value in parameter port 0, then the palette will be color.
  • Parameter port 1 contains the total number of colors to generate in the palette. The only available options for the number of colors are 0 (2 color), 1 (4 color), 2 (16 color), and 3 (256 color). Only the lower two bits of parameter port 1 are considered.
  • This command allows the KV-APP to have full indirect access to all of the registers in the FPGA. This command also allows the KV-APP to have indirect access to the EEPROM and the ICS-1 522 video chip.
  • Parameter port 0 defines the device to access. These are the same as for the serial addressing section:
  • Bit 7 is a Read/Write bit. All other bits of parameter port 0 are ignored.
  • Parameter port 2 is where the data is returned for read operations and entered for write operations. For read operations, the data in parameter port 2 is valid when the busy status flag is reset.
  • the EEPROM is accessed through keyboard commands.
  • the keyboard interface can also require multiple bytes. Since this command can only send one byte at a time, multiple calls to the keyboard may be necessary in order to fully access it. Keyboard reads will always return the keyboard output register. Since the ICS1 522 chip uses 11 bit registers instead of the usual 8, only the lower 8 bits are returned or set. To access the upper 3 bits of the register, 32 is added to the register number before invoking this command.
  • VIDEO CHECKSUM MANAGER Video CHECKSUM MANAGER
  • All video modes are divided into 32K segments. Each one of these segments has a checksum associated with it. There can be up to 64 of these segments in the 1280x1 024 resolution.
  • the main card CPU stores the checksums in its RAM memory.
  • the TRANSFER command is the only way that the KV-APP can write to the checksum registers.
  • the following table represents the various video modes. The number of segments in each video mode are shown. The number of physical lines per segment follows in parenthesis. Note that not all modes are supported by KeyView Pro.
  • parameter port 0 contains the number of video segments used and parameter ports 1 and 2 contain the number of lines in each video segment.
  • the MSB is in parameter port 1 and the LSB is in parameter port 2.
  • This subcommand selects the segment that the video capture hardware will write to the video RAM.
  • the segment number is written to parameter port 1. With this option, the segment will not increment automatically.
  • parameter port 0 contains a compressed byte.
  • the upper 6 bits contain the total number of keyboard bytes available (including any returned with this command).
  • the lower two bits contain the number of keyboard bytes that are cunently being returned. Up to two bytes can be returned with a single call to this command.
  • the first byte returned will be in parameter port 1 and the second will be in parameter port 2.
  • j. 09 (SERIAL PORT MANAGER) This command sets the base port and IRQ of the 8250 serial port controller.
  • the LRQ is written to parameter port 0 and the base port address is written to parameter ports 1 and 2.
  • the MSB is in parameter port 1 and the LSB is in parameter port 2. If all of the parameter ports are zero, then the 8250 chip will be disabled without affecting the actual LRQ and base port address. If all of the parameter ports are 255, then the cunent values of the serial port are returned without changing them.
  • this design uses a flash palette converter 52, shown in Figure 5.
  • This circuit uses a simple hardware circuit to convert RGB 5-5-5 color inputs directly to a palette index. The circuit will allow the main card CPU 21 to program the Flash Palette Converter RAM 24 with values on the fly so that the video mode can be changed.
  • the palette index that is output by this circuit is not a color value and has no direct co ⁇ elation to color or luminance. It is simply an index that is used by the VGA card to look up the preprogrammed color values. Computations and comparisons on the palette index value will not necessarily yield meaningful results.
  • the output from the video capture circuit 53 is digital video in RGB 8-8-8 format.
  • the Flash Palette Converter RAM 24 has only 15 address inputs, the three least significant bits of each color are discarded to form video in RGB 5-5-5 format.
  • the address and data lines of the Flash Palette Converter RAM are both fed by way of two multiplexers 54 and 55.
  • the address multiplexer 54 is a simple, unidirectional multiplexer that will handle all 15 address bits.
  • the multiplexer has two input selections and one output. The data going through the address multiplexer travels in only one direction regardless of which input bank is selected. There are two possible input banks to the address multiplexer. The select input to the multiplexer will switch between the RGB 5-5-5 signals for no ⁇ nal operation and the output of a 15 bit counter for program mode.
  • the data multiplexer 55 is a little more complicated. During no ⁇ nal operation, the data signals coming from the I/O pins on the Flash Palette Converter RAM 24 are output only and are sent to the Pixel Storage Circuit 56. The data flow is one way only in normal operation mode. However, in program mode, the data flow is bidirectional. In program mode, the multiplexer 55 makes a bidirectional data connection between the FPC RAM 24 and the FPGA data register 57 that contains the byte to write to it. Thus, in program mode, the RAM contents can be both read and written. The reason for allowing the data to be read out in program mode is for self-diagnostic pu ⁇ oses.
  • the Flash Palette Converter timing circuit 58 generates the various control signals that are needed throughout the FPC circuit. These signals include RD/WR' and CS' of the RAM 24, CLR and CLK of the address counter 59, and the two SEL lines to the multiplexers 54 and 55. It will use the FPGA registers 57 and the pixel clock as input. The pixel clock is needed during normal operation to ensure that the RAM reads are timed properly. In program mode, the pixel clock is not used.
  • the SEL lines to the multiplexers are connected to the flag in the FPGA registers that control the operation of the SEL signal.
  • the CLR signal to the address counter is done the same way.
  • the RD/WR' input to the FPC RAM is held high while the CS' input is connected to pixel clock.
  • the pixel clock is conditioned in such a way as to account for propagation delay and RAM access times. This signal is also passed on to the Pixel Assembly Circuit.
  • the address to the FPC RAM is supplied by the 15 bit counter. This counter is cleared to zero under CPU control by toggling the FPGA register flag that co ⁇ esponds to the CLR pin on the counter. The counter is then incremented by the FPC timing circuit following READ and WRITE operations by the CPU to/from the FPGA data register.
  • the sequence of timing signals is shown in the timing diagram of Figure 6.
  • a standard clock (FPGA CLK) reference will be necessary for program operation.
  • the pixel clock (PIXEL CLK) cannot be used because there is no guarantee that it will exist, nor is its frequency well established.
  • the standard FPGA clock is therefore used for generating timing patterns when in program mode.
  • the Address Clock signal occurs after the RAM Rd/Wr' signal.
  • the Address Clock (Addr CLK) is the pulse that is used to advance the 15 bit address counter 59 during programming.
  • the CPU RD' and CPU WR' signals are random in length, therefore, the Address Clock signal will not rise until the CPU signal has returned high. When that happens, the Address Clock signal will rise for exactly one FPGA clock cycle.
  • the ALE strobe from the main card CPU 21 as the clock source for program mode.
  • the very next ALE pulse after the conclusion of the RD' or WR' strobe (and only that pulse) can be used directly as the Address clock pulse.
  • Care in designing any circuits that use the ALE should be taken so that there is no direct connection to the Address Counter. If that were to happen, the main card CPU would not be able to co ⁇ ectly read or write to the FPC RAM. The main point is that the Address Counter is incremented only after a byte is read or written to the FPC RAM.
  • the pu ⁇ ose of the Pixel Assembly Circuit 75 ( Figure 8) is to compact up to eight pixels into a single byte for storage, as shown for example in Figure 7.
  • the number of pixels that will fit in a byte depend on the number of bits per pixel of the particular color mode in use. There is a direct co ⁇ elation between the number of bits per pixel and the number of possible colors. There will not be a situation where there are pixels of different sizes stored in the same byte.
  • one bit per pixel mode 70 there are only two possible colors and eight pixels are stored in a single byte. Because there are only two possible colors, this mode can only be used for monochrome screens. The colors used in two color mode do not necessarily have to be black and white, but could be any two colors. Similarly, the original captured screens can be any number of colors. The action of the Flash Palette Converter will automatically select one of the two colors that is closest. In two bits per pixel mode 71 , there are four possible colors and four pixels are stored in a single byte. Because there are only four possible colors, this mode is on the borderline of reasonable color. Some text screens, such as those designed for CGA monitors, have only four colors to capture. However, in practice, the two bit mode is best suited for four level grayscale. Again, it makes no difference how many original captured colors exist on the host. The Flash Palette Converter will automatically approximate each color into the appropriate gray level.
  • Circuit 75 of Figure 8 is to pack the pixels into a byte that will be stored in the video RAM and eventually sent across the bus 23 to the PCI APP.
  • 256 color mode all eight bits are used so for that mode, the Pixel Assembly circuit simply passes through the byte.
  • the Pixel Assembly Circuit In all other modes, the Pixel Assembly Circuit must assemble a byte from fragments of up to eight pixels.
  • the output byte from the Flash Palette Converter RAM 24 is applied to a special eight bit register.
  • This register is really a latch composed of eight, independently controlled D-type flip-flops 78. With this configuration, each bit on the input side can be selectively loaded into the register.
  • the Sum-of-Products (SOP) logic a ⁇ ay 77 controls which bits are loaded and when the inputs to the SOP circuit 77 are the color mode and a tliree bit counter.
  • the color mode is as previously defined and is used by the SOP logic a ⁇ ay 77 compute the number of pixels that are loaded into a single byte.
  • a value of '00' represents one bit per pixel mode (2 colors).
  • a value of 'OT represents two bits per pixel mode (4 colors).
  • a value of TO' represents four bits per pixel (16 colors).
  • a value of T T represents eight bits per pixel (256 colors). This value is obtained directly from the appropriate FPGA register.
  • the tliree bit counter 76 is provided so that the SOP logic anay 77 knows which part of the byte to load. In 256 color mode, all eight bits are used so the counter is ignored. In 16 color mode, only the lsb of the counter is used.
  • the CLK strobe to the three bit counter 76 is connected to the Byte Ready Strobe from the Flash Palette Converter circuit 52. This pulse is used to increment the counter once for each pixel that comes in.
  • the CLR strobe to the three bit counter 76 is derived from the Hsync pulse.
  • the pu ⁇ ose of this a ⁇ angement is to ensure that the counter will be zero for the first pixel on each horizontal line. It might not be possible to use a raw Hsync pulse, but the signal that clears the counter can be derived from it by using the appropriate gates.
  • the pixel byte from the Flash Palette Converter RAM 24 is presented to the inputs of the eight flip-flops 78.
  • the SOP logic anay 77 will signal the flip-flop in the DO position to load, and no others.
  • the next pixel byte comes in only the flip-flop in the Dl position will be loaded, and no others. This continues until the eighth pixel byte comes in and is loaded into the D7 position.
  • D7 clock strobe also functions as the Byte Ready Strobe for the next circuit.
  • the X and Y variables co ⁇ espond to the two bit color mode from the appropriate FPGA register.
  • the X is the least significant bit and the Y is the most significant bit.
  • the color modes are "00" for 2 color mode, "01” for 4 color mode, "10” for 16 color mode, and "11” for 256 color mode.
  • the A, B, and C variables are the output of the 3 bit counter.
  • A is the least significant and the C is most significant.
  • Out2 ⁇ m(2,9,13,16,18,20,22,24,25,26,27,28,29,30,31)
  • Out2 XY + A ' Y + AB ⁇ X + A ' BCX '
  • Out3 ⁇ m(3,9,13,16,18,20,22,24,25,26,27,28,29,30,31)
  • Out3 XY + A ⁇ + AB ⁇ X + ABCX ' Y '
  • Out4 ⁇ m(4,10,14,17,19,21,23,24,25,26,27,28,29,30,31)
  • Out4 XY + AY + A ⁇ X + A ' B ' CX ' Y '
  • Out5 ⁇ m(5,10,14,17,19,21,23,24,25,26,27,28,29,30,31)
  • Out5 XY + AY + A ⁇ X + AB'CX'
  • Out6 ⁇ m(6,l 1,15,17,19,21,23,24,25,26,27,28,29,30,31)
  • Out6 XY + AY + ABX + A ⁇ CX ' Y '
  • Out7 ⁇ m(7,l 1,15,17,19,21,23,24,25,26,27,28,29,30,31)
  • Out7 XY + AY + ABX + ABC
  • FPGA designs speak in terms of logic cells and not gates. In reality, since the logic cells include the above gates as well as flip flops, only 8 logic cells are required for this design. The three bit counter will add another three logic cells. Therefore, the total circuit requires only 11 logic cells.
  • the 32x8 SRAM approach requires wait states even if very fast 5ns SRAMs are used.
  • the reason for this assumption is that the FPGA would have to operate at over 200MHz in order to make the four 8 bit reads, concatenate them into a single 32 bit word, and present them on the PCI bus. Since the FPGA/PCI MASTER only operates at around 100 MHz, this means that there could be as many as four wait states per 32 bit word transfer. This would choke data transfer speeds and would not be acceptable. Instead, it is better to keep the video storage at 32 bits for the present embodiment.
  • a speed of 12ns or faster should be acceptable.
  • the SRAM may have "Byte Write” capability 7 (an example of such is Cypress CY7C1337).
  • Cypress CY7C1337 an example of such is Cypress CY7C1337).
  • This alternative allows the use of an 8 bit Pixel Assembly Circuit (thus reducing the number of gates) while still presenting a full 32 bits to the PCI bus. Since there are 4 write strobes on the RAM (one for each byte), a simple cyclic 4 bit counter can be used to load the byte into the proper location of the 32 bit word.
  • FIG. 9 A detailed diagram of the Keyview II example embodiment Expansion Card is shown in Figure 9.
  • the attached Figure 9 is not to be inte ⁇ reted as an exclusive schematic for the expansion card but only as a general block diagram description for the functionality of the Keyview II Product.
  • the block diagram is divided into fifteen separate sections as identified by the broken line enclosures for each block. All I/O's for the Keyview II card ("KV card”) is through three connectors, i.e., the VGA DB-15, the Cybex 44-pin, and the PCI plug-in connector located at the bottom of the expansion card.
  • Input power for the card (+5VDC) is derived from the PCI motherboard of a standard PC, through the PCI connector.
  • Section 1.0 of Figure 9 is the power supply circuit. Because the KV card requires a negative -5VDC rail which is used in the input video section of the card, it is necessary to derive the negative voltage from the standard +5VDC rail supplied by the PC motherboard.
  • the negative voltage is derived by using a charge- pump technique in which the +5VDC is converted to a power dock signal using a comparator circuit and a power buffer stage a ⁇ anged in a push-pull mode.
  • the output of the power clock is AC coupled and DC rectified using a two diode bridge as shown.
  • the diode bridge acts as a DC restoration circuit in which the reference level is +0.7 volts.
  • the second diode biases the reference level to ground potential.
  • the full excursion of the clock (5 Vpp) is forced to operate below ground, thereby providing the necessary negative rail of -5 VDC.
  • Section 2.0 of Figure 9 is the Video Input Buffering circuit.
  • the input video buffer circuits is composed of six (6) wide bandwidth operational amplifiers configured as unity gain amplifiers and as non-inverting amplifiers with sufficient voltage gain to meet the input voltage requirements of the analog-to-digital converters (ADC's) of Section 3.0, discussed below.
  • ADC's analog-to-digital converters
  • the input video signals (Red, Green, Blue) from the 15-pin VGA connector must be properly terminated into 75 ohms to minimized overshoots and ringing also known as impedance matching the coaxial cables.
  • the video signals are buffered using tliree non-inverting unity gain amplifiers and allowed to pass-thru to the Cybex 44-pin connector to be used by an external monitor which will also terminate the signals into 75 ohms.
  • the other three video amplifiers are configured with a gain of 4X to amplify the video levels to a maximum level of 3 Vpp, which is the level required by the ADC's.
  • Section 3.0 of Figure 9 is the Analog-to-Digital Converter (ADCs) circuit.
  • ADCs Analog-to-Digital Converter
  • Three high-speed analog-to-digital conversion circuits (preferably TDA8714) are used to digitize the input video levels provided by Section 1.0.
  • the ADC's have an 8-bit resolution specification and can process at a conversion sampling rate of up to 80MHz. This sampling rate is sufficient to meet the video bandwidth requirements of the SVGA pixel format of 1024x768 at 60Hz, refresh rate. All digital inputs and outputs are TTL compatible, which is commensurate with the logic level requirements of the main FPGA#1 (of Section 4.0 described below).
  • the ADCs receive the conversion clock from the pixel clock generator which is derived in the clock generation circuit of Section 10.0.
  • the clock from the pixel clock generator (PCG) is precisely synchronized with the original clock which generated the input video signals.
  • the outputs from the ADC's are fed to the main FPGA#1 of Section 4.0.
  • the ADC's are enabled (CE) by the FPGA#1 by an active low level.
  • Power to the ADC's is supplied by an analog +5V and a digital +5V. Although both voltages are the same, the analog and digital references are with regard to the required external power supply filtering to the appropriate input power pins. They also refer to the PCB layout trace procedure for the appropriate power pins.
  • Section 4.0 of Figure 9 is the Main FPGA#1 circuit.
  • FPGA#1 (element 12 in Figure 1) is an 7K gate a ⁇ ay (144-pin) which controls all video data traffic between the ADC's, the tliree external 32Kx8 S-RAMs 24-26, the main CPU (21), and the PCI Master Gate Anay 22. It also receives the card ID code which is read by the main CPU 21.
  • the FPGA#1 also determines the Check Sum difference between two video frames and delivers the difference to the FPGA#2 (co ⁇ esponding to elements 13 in Figure 1 and Section 7.0 in Figure 9) to be processed by the PCI master.
  • the check sum difference is derived from the comparison between one of the S-RAMS in Section 5.0 and the Palette RAM in Section 6.0. It also receives commands from the main CPU to activate the number of colors to be transfened from the ADC's to the PCI Master.
  • the FPGA#1 can select either two (2), four (4), sixteen (16) or two hundred fifty-six (256) colors to be processed by the PCI Master, as dictated by the main CPU. It controls the interleaving function of the two external S-RAMS as shown in Section 5.0 (and conesponding to elements 25-26 of Figure 1). This interleaving function allows the external S-RAMS to operate as Read and Write elements to the PCI Master Anay.
  • the interleaving function is initiated from the CPU via the PCI Master A ⁇ ay to the main FPGA 1.
  • tliree logic multiplexers MUX 1 , MUX2, and MUX3 of FPGA # 1
  • the input serial ports for the main CPU are also provided by the main FPGA #1.
  • a Timing and Control Section is required within the FPGA #1 to precisely synchronize the various control functions as describe above.
  • the only input power to the FPGA #1 is +5 VDC.
  • Sections 5.0, and 6.0 of Figure 9 are Interleaving 32Kx8 External RAMS. All Address, Data, Read/Write, and Chip-Enable (CE) control lines are provided by the main FPGA #l's multiplexer sections. The two external RAMS of Section 5.0 and the RAM of Section 6.0 are not part of the Main FPGA and are stand-alone chips. The access times of the S-RAMS can be 12n5 maximum, which is commensurate with the maximum data rate of 80MHz.
  • Section 7.0 of Figure 9 is the FPGA #2.
  • FPGA #2 is the second Field-Programmable-Gate A ⁇ ay of the KV card and is a 4K gate a ⁇ ay, 144-pin chip.
  • FIG. 9 shows that there is a Timing and Control Section, a VGA Format Decode Section, a Video Latch Area, CPU Serial Ports, and the PCI Master Gate Anay Section. It is the function of the PCI Master to act as a "bridge" between the main FPGA 1 1 and the PCI Buss.
  • the FPGA #2 receives the video difference calculation from FPGA #1 and stores the data in input video latches. In conjunction with the Timing and Control Section, it transfers the video data to the PCI Master to be read out to the PCI Buss (Section 13.0) at the PCI transfer rate of 33MHz.
  • the VGA Format Decode section dete ⁇ nines the VGA pixel fo ⁇ nat.
  • the VGA modes can occur at either 640x480, 800x600, or 1024x768, all at either 60Hz or 72Hz refresh rate. It is the function of this section to determine which VGA format is being addressed by using the coded info ⁇ nation present in the polarities of the horizontal and vertical sync signals. By using logic which inte ⁇ rets the sense of the logic levels, a combination of active high and active low TTL signals, the conect VGA fo ⁇ nat can be decoded. The information is then stored in a shift register and presented to the main CPU, (Section 9.0).
  • This information is required by the Main CPU to calculate the required divisor number for the pixel clock generator, in Section 10.0.
  • the required shift registers for the main CPU and the Keyboard CPU are also provided by the FPGA#2, such that the Keyboard CPU can communicate with the Main CPU.
  • the second FPGA acts as a conduit for the two CPU's to communicate.
  • Section 8.0 of Figure 9 is the System Clock circuit.
  • This section of the block diagram is a stand-alone clock chip which can provide three separate clock frequencies.
  • the output frequencies can be manually programmed and are derived using a frequency synthesizer involving PLL techniques working from an external cr stal.
  • the system clock provides a lOOMHz, 24MHz and lOOKHz clock.
  • the 24MHz clock is used by the on board CPU's (87C52-24).
  • the lOOKHz clock is used to generate the -5VDC rail, and the 100MHz clock is used to drive both FPGA's.
  • a 24MHz clock is shown as inputs for both CPU's this frequency can be changed to another frequency such as 22IvIHz if desired.
  • Section 9.0 of Figure 9 includes the Main CPU and Keyboard CPU.
  • the main CPU and Keyboard CPU communicate with both FPGA's.
  • the main CPU is programmed to direct data between the external SRAMs and FPGA#2 in accordance with the interleaving function, the number of colors selected, and the readout of the checksum difference to FPGA#2.
  • the main CPU requires an external SRAM (32Kx8) (Section 11.0) similar to the other tliree SRAMS around the main FPGA#1. It's external SRAM is used to store data from the keyboard and mouse devices, and from the VGA Format Decode Section of the second FPGA#2.
  • the data from the VGA Format Decode Section is used by the main CPU to produce the conect divisor number for the Pixel Clock Generator (Section 10.0).
  • the number will be a difference value for each pixel format ranging from 640x480 to 1024x768 at 60Hz and 72Hz refresh.
  • the KV card is designed to capture video at 640x480, 800x600, 1024x768, at 60Hz and 72Hz. Therefore, a total of six divisor numbers will be generated by the main CPU and fed to the Protocall Co ⁇ ector of Section 10.0, which in turn will feed the number to the ICS 1522, dot clock generator.
  • Section 10.0 of Figure 9 includes the Pixel Clock Generator (Dot Clock Generator)
  • Section 10.0 uses the feedback divisor input from the main CPU (Section 9.0) and the Horizontal Sync Input from the Host PC via the DB-15 input connector, to produce the output pixel clock which is used by the tliree Analog-to-Digital Converters in Section 2.0 to convert the analog data to digital data.
  • the output frequency of the PLL is determined by the input Horizontal frequency and the Feedback Divisor number from the mam CPU which changes as a function of the VGA Pixel Format.
  • the Horizontal Sync is actually a Composite Sync Signal which includes-the Vertical Sync Signal.
  • the Vertical Sync period there can be a complete absence of Horizontal Sync pulses, or there can be what is known as Equalization and Senation pulses in accordance with the EIA Standard R5343A.
  • Some Graphics Cards will include the Equalization and Senation pulses while others will exclude them entirely.
  • the Equalization and Senation pulses are actually 2X horizontal pulses during the vertical blanking period, where 2X co ⁇ esponds to twice the horizontal frequency. The effect of either the absence or the existence of the 2X pulses has a profound effect on the Phase-Lock-Loop.
  • any PLL to operate as either a second-order or third-order feedback system requiring time to respond to any differential change in input frequency.
  • the PLL will overshoot and undershoot due to an input frequency change and will finally settle to a steady-state condition.
  • the PLL looses "lock" during the differential change in frequency, i.e. loss of horizontal pulses, it will require a finite time to re-acquire and re- lock to the input frequency. It is for this reason that the PLL must be designed to perform, i.e., not loose lock, during the absence or frequency doubling of the horizontal input signal.
  • Section 10.0 a method is used to avoid the loss of lock by using a Sample-and- Hold Circuit which effectively "breaks" the feedback loop of the PLL during the vertical blanking period.
  • the disconnection is perfo ⁇ ned at the output of the phase detector of the PLL.
  • the phase detector accepts a signal from the input horizontal sync and the feedback clock.
  • the loss or addition of 2X pulses would cause the output of the phase detector to produce a large phase e ⁇ or signal causing the VCO to move in the direction of the frequency change, i.e., either lower or higher in output frequency. Due to the differential change, the PLL loop would require additional time to acquire and settle to its steady-state condition.
  • the result would be a disturbance period once the normal horizontal pulses returned, after the vertical blanking period.
  • the design technique which is used in Section 10.0 is to remove the phase enor signal from the phase detector, during the Vertical Blanking Period.
  • the Vertical Blanking Period is also generated in the VGA Fo ⁇ nat Decode Section of the second FPGA#2 and fed to the Hold signal of the Sample-and-Hold Circuit.
  • the Vertical Blanking Period also varies as a function of the VGA Pixel Format and can vary from 500us to 1.2mS. It is therefore only necessary to use a hold period which exceeds the maximum vertical blanking period. To accomplish this, the input vertical sync pulse is extended within the Sample-and-Hold Circuit to a maximum of 1.5mS.
  • Section 11.0 of Figure 9 is Main CPU SRAM, the reason for which is described above with respect to Section 9.0.
  • Section 12.0 of Figure 9 is the Keyboard & Mouse Devices. These devices are needed in order for the Remote PC to Control the Host PC during an access session.
  • Section 13.0 of Figure 9 is the PCI Bus.
  • the PCI Bus is part of a standard PC Motherboard Design.
  • Section 14.0 of Figure 9 is a brief list of example integrated circuits disclosed KV card embodiment:
  • Section 15.0 of Figure 9 is the ID Dip Switch To meet the requirement of remotely accessing multiple Host PC's, where each Host PC is matched with one Keyview-Pro Expansion Card, it is necessary to provide an I.D. code for each card, up to a total of eight cards. In order to accomplish this, a manually programmable DIP switch will be used as shown in Section 15.0. This 3-Bit code will be accepted by the main FPGA#1 and passed to the main CPU for card identification and tagging. Remote Reset Card Specification
  • each KEY-VIEW PC includes one KEY- VIEW ISA "Reboot" card 90 designed to pe ⁇ nit the KEY- VIEW PC to be remotely reset, to capture the caller's ID and to control the KEY-VLEW PC's turbo light.
  • Reboot card (AKA access control card) is shown in Figure 1 1 , with further detail shown in Figure 12.
  • a phone line is connected into the phone jack 91 on the back plate of the card.
  • a phone out jack 92 permits the pass tlirough of the phone signal to either a telephone or a modem.
  • the card When a call is received, the card captures the caller's ID and passes any ED received to the KEY-VLEW APP via the ISA bus. Storage on the card is sufficient to handle the cu ⁇ ent caller's ID (i.e., one may, but need not provide storage on the card of caller ID numbers from previous calls). Since the caller ID can only be captured between the first and second ring, pcAnywhere on the KEY- VIEW PC is set to answer on the third ring (or a higher number of rings), if the user wishes to capture the caller's ID.
  • the card has the ability to count incoming rings and thereby permit the CPU on the card to take actions based on the number of rings detected. Ideally this ring detection feature also handles rings in foreign countries.
  • the card also has a DTMIF decoder capable of accurately distinguishing a remote user's touch tone entries after the modem in the KEY- VIEW PC has answered a call. Since a modem generates noise immediately after answering a call and until the call is te ⁇ ninated by the modem, the DTMF decoder is able to accurately recognize a remote user's tones while this noise is occu ⁇ ing. Any tone received by the remote user will be passed back to the card's operating system. Up to eight tones may be captured in this manner per call.
  • hardware means on the card sends back an audible tone to the caller (that can be heard over the modem noise discussed above) confirming that the conect code has been received.
  • the operating system of the card may need to reboot the PC if less than a user specified number of rings (e.g. 3 rings) are detected. This feature is necessary in cases where the modem answers a call on tliree rings, but the KEY- VIEW APP or pcAnywhere APP is locked up and the user is not at a touch tone phone that will activate the touch tone code feature or in a country that the DTMF decoder will not recognize tones.
  • a user specified number of rings e.g. 3 rings
  • the KEY-VLEW PC may need to be booted if more than a user specified number of rings (e.g. 10) is detected to handle a case where the modem fails to answer a call, in which case a remote user would have no way to enter touch tones.
  • This user option will also be needed in cases when the KEYVIEW PC does not have a modem. From an operating viewpoint, the hardware on the card simply passes ring information, caller ID information and touch tone info ⁇ nation back to the card's operating system which would decide what to do with the info ⁇ nation based on how the user has configured the card to operate.
  • the reboot card 90 will cause the KEY- VIEW PC to reset by sending a signal to the reset pin on the PC's motherboard, assuming that a two pin cable is installed between the re-boot board's reset pins and the reset pins on the KEY-VLEW PCs motherboard.
  • a PJ-45 jack, standard serial interface is provided, to permit the card's operating system to control power to the KEY- VIEW module connected to the port.
  • the second function of the reboot card 90 is to control the turbo light on the KEY-VLEW PC's front panel, assuming that a two pin cable is installed between the re-boot board's turbo pins and the turbo pins on the KEY-VLEW PC's motherboard.
  • the turbo light would be used to visually indicate when a remote user is accessing the KEY-VLEW PC and to indicate whether the KEY- VIEW PC was in Host mode or a Menu mode.
  • the KEY-VLEW PCs turbo light will be off when the KEY- VIEW PC is in a Menu mode and is not being remotely accessed.
  • the KEY-VLEW PCs turbo light will be ON when the KEY- VIEW PC is in a Host mode and is not being remotely accessed. This light will flash ON briefly whenever the KEY- VIEW PC is in a Host mode and is being remotely accessed. More specifically, the turbo light should remain OFF but flash ON (for .5 seconds) every 5 seconds, whenever the KEY-VLEW PC is being remotely accessed (i.e. pcAnywhere is "In session") and is in a menu mode.
  • the turbo light should remain ON and then flash OFF for .5 seconds every 5 seconds.
  • the KEY- VIEW APP running on the KEY- VIEW PC must be able to send commands or a code to the reboot card via the ISA bus to tell the boot card what to do with the turbo light as follows: Code Action
  • Host PC's (201-204) keyboard, mouse, and monitor are disconnected from the Host PC. These peripheral devices are of no further use and may used for the KEY-VLEW PC or elsewhere by the customer.
  • a supplied multi-port interface cable 213 is connected from the KEY-VLEW PC's PCI card's 25 pin connector to the Host PC's keyboard, mouse and video card input ports, so that when necessary the KEY- VIEW PCs optional monitor, keyboard and mouse (not shown in Figures 28-29) could be used to control the Host PC 20-1204, similar to how a PC switch box is used on site to control multiple PC's.
  • An appropriate mouse driver would be installed on the Host PC and may be a Keyview mouse driver in place of any existing driver.
  • the KEY- VIEW PC would be automatically trained (as described later) to recognize the video output signals of the Host PC and mouse control procedure of the Host PC using software provided with the KEY-VLEW II system.
  • KEY-VLEW II alternatively permits connecting the card directly to a supported PC switch box that ma ⁇ ' in turn allow switching between multiple PC's using special keyboard hot keys. If the KEY-VLEW PCI card is to be connected to a supported third parly switch box, it is advisable to power off all PCs connected to the switch box. If NET-91 1 Control Modules ( Figure 10) are to be connected to the Host PCs connected to the Switch Box, then the Control Modules are daisy-chained and connected to these Host PCs; as shown in Figure 10.
  • One KEY- VIEW Access Control Card 90 may be installed m a ISA slot in KEY- VIEW PC.
  • the primary functions of this card are (1) to permit the KEY- VIEW PC to be remotely rebooted in the event it should lockup; (2) to alert host site personnel that someone is remotely accessing the KEY- VIEW PC by causing the turbo light on the PC to blink; (3) to capture and log the caller ID of anyone attempting to access the KEY- VIEW PC by modem, (4) to optionally automatically terminate a phone connection if the caller ID has been blocked or the caller's phone number does not match a list of pre-authorized numbers, and (4) to issue pager alerts in the event an unauthorized user is detected.
  • the first alternative is shown in Figure 12 and requires that an optional NET-911 Control Module 80 be connected to the Access Control Card's RJ-45 DATA port using the RJ-45 cable provided with the module 80.
  • the module's AC power output cord is plugged into the KEY-VLEW PC's power input receptacle and the module's AC power input cord is plugged into a source of AC power such as a wall outlet or UPS.
  • a KEY- VIEW Control Module is used in this manner no other modules may be daisy chained to this module.
  • the KEY-VLEW PC will be automatically cold-booted by instructing the module to temporarily cut power to the KEY- VIEW PC for 20 seconds when the reset card dete ⁇ nines that the KEY- VIEW PC should be rebooted (see below).
  • This alternative is the recommended remote boot approach.
  • the second alternative for rebooting the KEY- VIEW PC requires that the two pin cable supplied with each access card be connected from the pins labeled Reset ( Figure 11) on the card 90 to the reset pins on the KEY-VLEW PC's motherboard and the reset button on the front of the KEY-VLEW PC be connected to the Access Control card 90.
  • the KEY-VLEW PC will be automatically reset by closing the pins on the KEY-VLEW PC's motherboard (as if the reset button was physically pressed) when the reset card determines that the KEY-V EW PC should be rebooted (see below).
  • the main advantage of using the Control Module alternative over the internal reset alternative is the Host PC can be cold booted, which is usually a more reliable means to insure that the KEY- VIEW PC and all cards in the PC are fully reset.
  • the primary advantage of the internal reset alternative is that it avoids the added cost of a Control Module 80. If both alternatives are installed at the same time, the Control Module alternative will be invoked first and the reset option only used if the Control module fails or is removed. In other words, when a Control Module 80 is connected to Access Control Card 90, the card will automatically sense the module's presence and cold-boot the KEY- VIEW PC, when necessary, instead of using the internal reset approach.
  • Reboot processing can either be initiated (1) based on the number of phone rings detected by the reset card or (2) via a password sent to an optional modem connected to the optional NET-911 Control module 80. Rebooting the KEY- VIEW PC remotely is necessary in the event the KEY- VIEW PC should ever lockup (i.e. not respond when a user attempts to access the KEY-VLEW PC remotely).
  • the access card 90 momtors all incoming phone calls and may be configured to reboot the KEY-VLEW PC in the event (1) less than a user defined number of rings are detected or (2) more than a user defined number of rings are detected.
  • the modem When a modem is installed in the KEY- VIEW PC, it is possible that the modem answers a call, but the KEY- VIEW and/or the remote access engine is locked up. In this case, it will be necessary to remotely reboot the KEY-VLEW PC. In order to do this the remote access engine is configured to tell the modem 82 to answer a call only after four rings. Then, the KEY-VLEW Enable Reboot when less than rings option (discussed later) should be set to three rings. Using these settings, a remote user would then simply call the KEY-VLEW PC and hang up after two rings, thereby causing the KEY-VLEW PC to reboot.
  • a modem installed in the KEY-VLEW PC could lockup and hang onto a phone line, so that the line was always busy when a remote user attempts to access the KEY-VLEW PC or to reboot the PC.
  • remote users may wish to have the ability to terminate another remote user's access during an emergency situation. Both of these situations can be resolved by connecting an external modem 81 to the RJ-45 DATA OUT port of the optional NET-911 Control Module 80 connected to the Access Control card (using the CMM modem RJ-45 to DB-9 (male) connector provided with the module). In this configuration (shown in Figure 12), a second (different) phone line must be connected to this optional modem 81.
  • Figure 12 illustrates how to connect both an optional NET-91 1 Control Module 80, an external modem 81, and an internal modem 82 to a Access Control Card 90.
  • any DIP switch setting on the modem should be set so as to not prevent the modem from auto-answering a call.
  • the option to use this modem must be enabled and a password defined.
  • a remote user would simply use a terminal emulation program such as Hype ⁇ erminal (supplied with Windows) to (1) call the external modem, (2) type "RESET" when the connection was completed and (3) enter the conect password when prompted by the Access Control card 90 thereby causing the KEY- VIEW PC to reboot.
  • An Access Control Card 90 also has the capability to issue pager alerts in the event a potential intruder is detected. Such pager alerts would be appropriate if a user fails to enter a conect password within a pre-specified number of guesses or a caller ID is detected from an unauthorized phone number. Person(s) to be alerted via pager and the related pager codes can be defined using the Pager Alert menu option (discussed later). In order to issue a pager alert, an optional external modem 81 must be connected to the Access Control Card 90, as discussed above.
  • a front panel status light e.g. turbo light
  • the KEY-VLEW PC's motherboard plugged back into the LED pins (J2 in Figure 11 ) on the Access Control Card 90.
  • This connection insures that one of the LED lights on the front of the KEY- VIEW PC blinks whenever someone is remotely connected to the KEY- VIEW PC.
  • This blinking coupled with an audible beep is designed to alert personnel at the Host site whenever someone is remotely accessing the KEY- VIEW PC.
  • the phone line has the optional caller ID feature from the phone company enabled so that KEY- VIEW will automatically capture the caller ID when a call is received.
  • Activating the caller ID service on this line permits the KEY- VIEW Access Control Card to track and log all calls received and to optionally automatically terminate a call from a remote user whenever (1) a caller ID is not available, (2) has been intentionally blocked (i.e. the caller precedes their call with *67). or (3) where the caller's ID is not on a list of pre-authorized ID's. See the Caller ID topic for information on how to configure these KEY- VIEW caller ID features.
  • a VGA monitor 214 is plugged into the KEY- VIEW PC's video card. Normally the monitor that was unplugged from the Host PC 201-204 or Switch Box is used for this pu ⁇ ose. This video monitor reflects what is happening in the KEY-VLEW PC or active Host PC and is normally the only monitor needed for the
  • KEY-VLEW PC When the KEY-VLEW PC is in a Host Mode this monitor reflects what appears on the active Host PC 201-204 on a slightly delayed basis. Since the KEY- VIEW PC can switch from Host PC to Host PC only one monitor is needed to view the active PC once the switching process is complete. Some users want to view the active Host PC 201 -204 on a real time basis. For these users, a Video output port exists on back of each PCI card that passes through the video output signal of the active Host PC for each PCI card on a real time basis.
  • KEY- VIEW PC permitting remote access via modem to the KEY- VIEW PC.
  • modem it is also suggested that another means of remote access be also installed in the KEY-VLEW PC, such as a LAN card.
  • a LAN card is installed in the KEY- VIEW PC that is compatible with a customer's internal network to pe ⁇ nit remote LAN or Internet access to the KEY-VLEW PC.
  • Network 206 may be a LAN wherein the remote PC 210 and Keyview PC 200 include internal LAN cards. Since remote access to a KEY- VIEW PC is often needed on an emergency basis, another means of remote access can be installed in the KEY- VIEW PC, such as a modem 81/82. After the applicable LAN card is installed in the KEY- VIEW PC.
  • the card should be connected to the LAN as shown in Figures 28 and 29.
  • No ⁇ nally NET-911 Control Modules are connected to one of the KEY- VIEW PCs serial port ( Figure 12). These modules are daisy chained together ( Figure 10) and connected to each Host PC accessible by the KEY- VIEW PC to permit serial access to and power control of the Host PCs by a remote user.
  • the serial access feature of the modules is normally used to facilitate file transfers between a Host PC 201-204 and KEY-VLEW PC 200. Any other device for which serial access and/or power control is required remotely, such as routers or printers, may be connected to modules on the daisy chain. So, in this regard the KEY-VLEW PC becomes an all inclusive platform for remotely managing network devices.
  • the operating system is loaded including any device drivers such as a LAN driver for a network interface card or the modem driver for any modem installed in the KEY- VIEW PC. Any Device drivers needed to access the KEY- VIEW PCI card(s) will be loaded to permit the KEY-VLEW application to communicate with the card.
  • device drivers such as a LAN driver for a network interface card or the modem driver for any modem installed in the KEY- VIEW PC.
  • Any Device drivers needed to access the KEY- VIEW PCI card(s) will be loaded to permit the KEY-VLEW application to communicate with the card.
  • the KEY- VIEW PCI cards operating system will be loaded from the KEY- VIEW PC's disk drive into the cards memory. This approach facilitates PCI card firmware upgrades to occur simply by replacing the PCI card's operating system's program files with new program files..
  • the remote access engine is automatically loaded in a "Host" mode using whatever means (up to 2) the user has specified to permit remote access to the KEY-VLEW PC (e.g. modem and LAN access could both be specified).
  • the KEY-VLEW II application (KV-APP) is then activated automatically, whereupon the following events occur:
  • the KEY- VIEW PC switches to an 800x600 graphics mode and the KEY-VLEW 11 graphics logo displays for 5 seconds. This Logo can be cleared sooner by pressing any key or clicking a mouse button.
  • the KEY- VIEW II logo While the KEY- VIEW II logo is being displayed, the KEY- VIEW application accesses information stored on a disk status file as to the last active Host PC (e.g.
  • PCI Card ID switch box PC ID, video driver for the
  • This information is then be sent as commands to the KEY-VLEW PCI cards thereby causing the appropriate KEY-VLEW PCI card to become the active card. If the last accessed KEY- VIEW PCI card is no longer accessible (e.g. it does not respond to the KEY- VIEW II applications request to become active), an e ⁇ or message will be displayed and the KEY- VIEW II system reverts to it's Menu Mode. While in a Menu
  • the KEY-VLEW PC will automatically initiate Host mode processing wherein the active Host PC's screen is mi ⁇ ored using the KEY- VIEW PC's full screen (i.e. the KEY- VIEW PC graphics mode is automatically adjusted to the graphics mode of the active Host PC) and Remote or Host site keyboard mouse inputs are forwarded to the active Host PC.
  • the KEY-VLEW application will operate in one of two modes, namely either a Host Mode or Menu Mode and normal KEY-VLEW II processing commences.
  • Tapping the left Ctrl key four times causes the KEY- VIEW PC to switch from a Host Mode to a Menu Mode.
  • From the Menu Mode either pressing the F5 key or selecting the Exit Menu Mode option from the KEY- VIEW main menu bar
  • Other option causes the KEY- VIEW PC to switch from a Menu Mode to a Host mode.
  • the KEY- VIEW Host Mode gives a user total control over the active Host PC from the KEY-VLEW PC.
  • all remote or host site mouse or keyboard input is trapped (i.e. redirected) by the KEY- VIEW application and passed to the active Host PC, as if the Remote/Host site's keyboard/mouse was directly attached to the active Host PC.
  • only one Host PC may be designated at any point in time as the active Host PC.
  • info ⁇ nation such as the status of the keyboard's num lock, caps, lock and scroll lock lights would be passed back through the KEY- VIEW system so the Remote and local PC's keyboard status lights would reflect the status lights of the active Host PC.
  • the KEY- VIEW II Menu Mode permits (1) configuring the KEY- VIEW PC for KEY- VIEW processing including adding PCI cards, Host PCs definitions, etc., (2) switching between Host PCs, (3) accessing NET-911 Control Modules to control power to Host PC and/or serial access Host PCs, and (4) creating video or mouse drivers necessary to successfully control a Host PC.
  • the KEY- VIEW Menu Mode both Remote and Host keyboard/mouse activity is input is directed to the KEY-VLEW PC. Normally a user would only switch to a Host Mode temporarily to perform a specific task, which is typically to switch from Host PC to Host PC or to access NET-91 1 Control Modules. A more detailed discussion of the processing options available under the Menu Mode are discussed under that topic.
  • the KEY- VIEW Host mode gives a user total control over the active Host PC.
  • all Remote or Host site mouse or keyboard input is trapped by the KEY- VIEW application and passed to the active Host PC, as if the Remote/Host site's keyboard/mouse was directly attached to the Host PC.
  • info ⁇ nation such as the status of the keyboard's num lock, caps, lock and scroll lock lights would be passed back tlirough the KEY- VIEW system so the Remote and local PC's keyboard status lights would reflect the status lights of the active Host PC.
  • the KEY- VIEW PC's screen When in a Host Mode, the KEY- VIEW PC's screen reflects what is being displayed on the Host PC's screen. In cases where the Host PC screen is in a different graphics mode, then the KEY- VIEW PCs screen, the KEY-VLEW application will automatically change the graphics resolution of the KEY-VLEW PC to match the graphics resolution of the Host PC's screen, so that the Host PCs screen will always be displayed on a full screen basis on the KEY- VIEW PC. Supported graphics resolutions are 640x480, 800x600 and 1024x768.
  • Hot key actions are triggered by 4 consecutive press-releases (taps) of the hot key within a 3 second interval .
  • Taps press-releases
  • a list of these keys are discussed below. Tapping hot keys four times was set as a standard for KEY-VLEW II to minimize any chance of interfering with similar multi-tap hot-key approaches that may be used by applications irinning on a Host PC. Hot keys must be tapped consecutively, so any key pressed other than the hot-key resets the hot-key tap counter.
  • KEY-VLEW PCI card When a KEY-VLEW PCI card is connected to a switch box, a special procedure exists to help avoid the need to switch from a Host mode to a Menu mode.
  • the KEY-VLEW menu system pe ⁇ nits the assignment of any one of the various supported switch box hot key sequences to the standard KEY-VLEW hot key sequence of tapping the Left Shift key four times.
  • the switch box command code of ⁇ NumLock> ⁇ Minus> ⁇ Num Lock> could be assigned to this special Left Shift key sequence for a given KEY-VIEW PCI card, so that when KEY- VIEW detects the Left Shift key sequence from either a Remote or Host site user while in a Host mode, KEY-VLEW would send the ⁇ NumLock> ⁇ Minus> ⁇ Num Lock> sequence to the Host PC and do whatever is necessary to load any drivers or other steps required when switching between PCs.
  • This approach has the added benefit of pe ⁇ nitting a user to use the same procedure at either a Host or Remote site to switch between PC's connected to a switch box.
  • KEY-VLEW will not look for the entry of any switch box vendor's hot key sequences. If such keys are entered and cause a switch box to switch PCs, the KEY-VLEW application may be unaware of the change and may not decode the video output of the new PC conectly. This may cause an unreadable Host screen image to appear on the KEY-VLEW PC.
  • KEY- VIEW When a user switches between PCs on a switch box via either (1) pressing a different channel selector button on the switch box or (2) entering the vendor's hot key sequence instead of tapping the Left shift key four times, KEY- VIEW will not be aware of the change until after the change occurs. In these cases, supported switch boxes are designed to send a special code back to the KEY- VLEW application alerting the application that a change has already occu ⁇ ed. In rare cases it is possible that this feedback may not occur. In this event the KEY-VLEW PC will not be in sync with the Host PC, causing the Host PCs screen to be scrambled.
  • the Host screen will be scrambled from the time the change is detected until KEY- VIEW performs the necessary steps to sync to the new Host PC's video output. Accordingly, tapping the Left Shift key is the recommended approach to switch between switch box PCs. In cases where this is no active Host PC, the KEY- VIEW application will not permit switching from a Menu Mode to a Host mode until a Host PC is successfully selected as the active Host PC.
  • the user at the Host site will see a slightly delayed painted image of the Host PC's screen (assuming a monitor at the Host site is connected to the SVGA card in the KEY- VIEW PC) and will be able to use the KEY- VIEW PC's mouse and keyboard to control the Host PC.
  • a Host site user could plug a monitor directly into the SVGA output of a PCI card and plug a second monitor into the KEY- VIEW PCs SVGA card to access KEY-VLEW Menu mode or to test how fast KEY- VIEW is displaying the Host screen (by using the two monitors to compare the KEY-VLEW PCI card's real time video output to the KEY- VIEW PC's SVGA card output).
  • users at a Host site will likely just plug one monitor into the SVGA output of the KEY- VIEW PC and minimize any screen paint delays by reducing the number of colors displayed.
  • a user at a KEY-VLEW PC with only one KEY-VLEW PCI card would rarely need to use KEY-VLEWs Menu mode or see the normal SVGA output of the KEY-VLEW PC's SVGA card. Even if this single PCI card were connected to an external PC switch box, the Host site user could enter keyboard "hot-key" commands to switch between PC's connected to the card, as opposed to going into a KEY- VIEW Menu mode. However, remote users would need to use the Menu mode because pcAnywhere may block the necessary keyboard hot key commands necessary to switch between PC connected to the switch box (e.g. ⁇ NumLock> ⁇ Minus> ⁇ Num Lock>).
  • Avoiding this need to switch to a Menu mode is desirable. If the remote user leaves a KEY- VLEW PC in a Menu mode and the timer used to automatically switch back has been disabled; a subsequent user at the Host site may become confused (because they will not see the KEY- VIEW'S screen is in a Menu mode) when they try to use the KEY- VIEW PC's mouse or keyboard and it doesn't pass tlirough to the Host PC. When a KEY-VLEW PC is rebooted, it will automatically attempt to initiate Host mode processing. This approach assures that KEY-VLEW PC is always ready to control the active Host PC.
  • KEY- VIEW When KEY- VIEW user security has been activated on a KEY-VLEW PC, KEY- VIEW will automatically terminate Host mode processing and display a special login screen each time the KEY-VLEW PC is remotely accessed. The remote user must then enter the conect Login ID and password before KEY- VIEW will permit access to the KEY- VIEW application. In addition to prevent a situation where a remote user attempts to gain access to the application by rebooting the KEY- VIEW PC, when user KEY- VIEW user security has been activated, KEY- VIEW requires that a user login whenever KEY- VIEW application processing is initiated.
  • the KEY-VLEW II Menu Mode permits (1) configuring the KEY- VIEW PC for KEY- VIEW processing including adding PCI cards, Host PCs definitions, etc., (2) switching between Host PCs, (3) accessing NET-911 Control modules to control power to Host PC and/or serial access Host PCs, and (4) creating video or mouse drivers necessary to successfully control a Host PC.
  • the KEY- VIEW Menu Mode both Remote and Host keyboard/mouse activity is input is directed to the KEY- VIEW PC.
  • the KEY-VLEW main menu options bar is at the top of the KEY- VIEW PCs screen while in a Menu Mode. This menu consists of several options and sub-options. When a main menu option is selected, additional menus are displayed. An example menu is shown in Figure 13.
  • control can be returned to the last active PCI card and Host PC whenever a Remote or Host site user taps the F5 key.
  • any active data entry item or unfinished new entry such as the definition of a new PC. will be ignored. For this reason, it is not recommended to hit the F5 key while any data entry process or transaction is active.
  • the recommended method to return to the Host mode is to select the Exit Menu Mode item from the Other menu option.
  • a Host site may not have a monitor connected to the KEY- VIEW PC's SVGA card. If someone at a Remote site leaves the KEY- VIEW PC in a Menu mode when terminating their connection, a Host site user may get confused and frustrated when they attempt to access a Host PC and find they do not have keyboard/mouse control. To conect this situation, the KEY- VIEW system has a feature that automatically returns to a Host mode if either Remote or KEY- VIEW keyboard input is not detected for a user defined number of seconds. The number of seconds desired is one of the data entry options in the Menu mode.
  • This auto-switch feature may be disabled by setting the number of seconds to zero.
  • a KEY-VLEW PC at a Host site is switched to a Menu mode or (2) KEY-VLEW application processing has been terminated on the Host PC
  • the Host site user will need to either reboot the KEY- VIEW PC or connect a monitor to the KEY- VIEW PC's SVGA card to control the KEY- VIEW PC. In either of these cases, control of any Host PCs connected to the KEY- VIEW PC will not be possible until the KEY- VIEW PC is returned to a Host mode.
  • the "switch" menu option of Figure 13 coordinates switching between PCs and switching between modules.
  • the Switch PCs sub-menu ( Figure 14) option is used to add delete Host PC definitions or permit a user to switch between Host PCs in cases where multiple Host PC's are connected to a KEY- VIEW PC.
  • KEY- VIEW supports switching between PCs either by (1) switching between KEY-VLEW PCI cards in the KEY- VIEW unit or (2) switching between PCs connected to a single card (via a supported switch box). This menu option permits switching between PCs in either of these two cases.
  • the Switch Modules sub-menu ( Figure 15) option permits switching between optional NET-911 Control Modules that may be daisy-chained together and connected to one of the KEY- VIEW PC's serial port.
  • This approach permits a remote user to control AC power or serial access to any device connected to each module (e.g. a Host PC, router, etc).
  • a list all NET-911 modules detected on the serial port is displayed. From this list a module may be selected as the "active module" pe ⁇ nitting AC power to turned ON or OFF to the device(s) receiving AC power from that module or the KEY- VIEW PC to serial access any device plugged into that module's serial port.
  • the switch pc's sub-menu option is a list of the all of the possible PCI card numbers (Card-IDs), and related, user specified, 40 character Description of what is connected to the card. An example list is shown in Figure 14.
  • the KEY-VLEW PC When the KEY-VLEW PC is booted the KEY- VIEW polls each of the 8 possible PCI card LD's to see which cards respond to the poll. A table will then be built by the KEY- VIEW of the cards that respond.
  • the Card ID column displays the KEY- VIEW PCI cards ID number which would range from 0 to 7.
  • the Card Description column displays a 40 character description of the card previously defined by the user.
  • the Select Host PC button applies to the PCI card ID presently highlighted in the PCI card list box. If the highlighted PCI card is connected directly to an active Host PC, then that Host PC will become the active Host PC and that PC will be controlled by the KEY- VIEW when the KEY-VLEW PC is in a Host Mode. If the highlighted PCI card is connected to a PC Switch box, then a window of those Host PCs defined for this Switch Box will be displayed as discussed further under the Switch Box PC List topic. What the KEY- VIEW PCI card is connected to is determined by the "Card Connected to" setting, as defined by clicking on the Settings button.
  • PCI card When a PCI card is selected, the PCI card is internally retested to make sure the card is still accessible. If it is no longer accessible, an e ⁇ or message is displayed.
  • the Settings button permits the configuration data for the highlighted PCI card to be entered or changed.
  • a window entitled “KEY- VIEW PCI CARD SETTINGS” appears showing the cu ⁇ ent setting for the PCI card. Processing occuning for this window is discussed under the "PCI Card Settings" topic following
  • Test If a card ID is installed that was not detected, that card number may be highlighted and the Test button option selected to check if the card may have just temporarily malfunctioned at boot up. When the Test option is selected, the highlighted card ID will be retested and if found the card's description will be displayed next to the Card ID on the PCI card ID list.
  • An entry is added to the KEY-VLEW event log whenever a new Host PC is selected as the active Host PC.
  • the KEY-VLEW PCI Card Settings screen permits entering or changing the configuration of the selected KEY-VLEW PCI card.
  • a description of each setting on this screen is as follows: "Card Description” is a user-defined description for each PCI card installed in the KEY- VIEW PC. "Card Connected To” references whether a KEY- VIEW PCI card is connected directly to either a (1) Host PC or (2) Switch Box that permits the PCI card to access multiple Host PC.
  • Switch Box Hot Keys This entry is not accessible (i.e. it is grayed out) when the Card Connected To setting is set to PC. Otherwise, the cunently selected switch box hot key entry is displayed in this pull-down
  • Switch Box Hot Keys are whatever key sequence has been specified by the switch box manufacturer to cause their switch box to go into a command mode to permit switching between channels (i.e. PCs) on their switch box.
  • FIG. 18 Upon clicking on this pull down menu's anow, a list of any switch box hot key commands supported by KEY- VIEW is displayed, an example list is shown in Figure 18.
  • a Hot key sequence is selected for each switch box connected to each PCI card. This approach permits different command mode sequences to be defined for each PCI card in a KEY-VLEW PC. This sequence will also be assigned to the KEY-VLEW PC's left Shift key, so that when the left shift key is tapped four times when connected to this PCI card, the command sequence will be sent to the switch box connected to the active PCI card. This left shift key procedure is very useful shortcut for Host site users to switch between PCs connected to a switch box without having to enter the KEY-VLEW menu system.
  • Video Drivers specifies up to a 12 character video driver name containing the video attributes needed by KEY-VLEW to properly inte ⁇ ret this Host PC's video output signal.
  • the "Mouse Interface” menu entry indicates the type of interface (i.e. PS/2 or Serial) to which this PCI card's mouse cable is connected.
  • the "Mouse Driver" menu defines the mouse driver name for any PC connected directly to the card. KEY-VLEW PC ID - This entry is not user updatable.
  • PC LD number is displayed only if the Card Connected To entry is set to PC.
  • each PC connected to the switch box must be defined and configured to permit the KEY-VLEW PC to access each PC.
  • This dialog box contains a list of all those PC previously defined and permits (1) designating a PC on the list the active Host PC, (2) modifying the configuration of a PC on the list, (3) adding and configuring a new PC, or (4) deleting a PC definition from the list.
  • the Switch Box PC List window displays information on each PC connected to the switch box as follows:
  • the PC LD column displays the PC's identifying number. Internally, KEY-VLEW assigns each PC added to the list a unique, sequential PC LD number. This number is useful in identifying the PC when viewing the KEY-VLEW event log. 2)
  • the PC Description column displays the 40 character user defined description of the PC.
  • the Switch Box PC Settings screen permits entering or changing the configuration of each PC connected to the PC switch box that is connected to the selected KEY-VLEW PCI card.
  • An example screen is shown in Figure 20. A description of each setting on this screen is as follows:
  • the Switch Box ID entry identifies the key sequence
  • the Video Driver entry specifies up to a 12 character video driver name containing the video attributes needed by KEY-VLEW to properly inte ⁇ ret this Host PC's video output signal.
  • the Mouse Driver entry defines the mouse driver name for the PC.
  • the KEY-VLEW PC LD m Figure 20 is an internally assigned a unique sequential number for each Host PC defined. This number will be a part of any driver file names related to the PC.
  • the Modules main menu bar selection permits accessing the module daisy chain (referenced in Figure 18), designating a module on the daisy chain as active, turning power OFF, ON or rebooting the device connected the active module and configuring module parameters.
  • This menu option is selected two sub-menu options appear as follows:
  • Module Processing - This menu selection pe ⁇ nits accessing and controlling all of the modules on a daisy chain. This includes (1) designating a module on the daisy chain as active so that the device connected to the module may be serially accessed, (2) turning power OFF, ON or rebooting the device connected the active module, (3) placing the module daisy chain in a Pass- Through mode, and (4) specifying criteria to be used by NET-91 1 to automatically control power to devices connected to modules based on external events.
  • COM port to which the module daisy chain is connected must be properly specified using the Module System Configuration menu option. For newly installed NET-911 module software the COM port is set to COM1 by default.
  • the module daisy chain on the COM port specified in the Module System Configuration is polled automatically.
  • the polling process takes about 1 second per module.
  • NET-911 determines if (1) new modules have been added to the chain, (2) modules have been deleted from the chain, or (3) the physical positions of the modules have changed, since the last time the daisy chain was polled. If any of these events occur, applicable messages are displayed on the screen at the end of the polling process and the changes are logged to the NET-911 event file. Also, any active modules are cleared during the polling process, which places the daisy-chain into a pass-through mode.
  • the Windows list box contains the following information: Pos This field shows the modules physical order (position) in the chain. Power This field contains the cunent power status of the AC power "POWER OUT" cord on the back of each module. "ON” indicates any device(s) connected the module are receiving power. “OFF” indicates power has been cut to the device(s). Module Description This is a user defined description of the device to which the module is connected.
  • the Activate button 120 makes the cunently highlighted module active.
  • a module must be made active before the module's power or other settings may be changed or before any device connected to the module may be accessed serially by third party supplied teiminal emulation software programs.
  • the Settings button 121 causes a setting window to appear with the following processing options and settings:
  • a Reboot button will reboot the active module. If this button is grayed-out, it means the module's "Output" AC power status is cunently OFF in which case a reboot can be accomplished by simply clicking on the Power ON button. When this option is selected, a confirmation window appears requesting confirmation to start the reboot process. In addition, if either of the "Require Reason" settings (see Module System Configuration) are checked, a window pops up requiring up to two 50 character lines describing why the devices connected to the modules are being rebooted.
  • a NET-911 module acts on it's own to restore power in the user specified number of seconds without any support from the NET-911 application.
  • a Power ON button will turn power ON to the active module. If the "Require Reason for Power ON Actions" settings (see Module System Configuration) is checked, a window pops up requiring up to two 50 character lines describing why power is being turned ON. A Power OFF button will turn power OFF to the active module. If the "Require Reason for Power OFF Actions" settings (see Module System Configuration) is checked, a window pops up requiring up to two 50 character lines describing why power is being turned OFF. Also under the Settings sub-menu are: a.
  • NET-911 is only concerned about the existence of the file.
  • File Name to Trigger Power OFF This unique NET-911 feature permits a Drv: ⁇ directory ⁇ file name to be specified that when detected by NET-911 causes power to be turned OFF to any device(s) receiving power from this module.
  • the specified file is detected by NET-911 , it is deleted before the power OFF action occurs to prevent infinite power OFF actions. This feature is useful to NET-911 customers with third party monitoring systems by allowing power to be turned OFF when a problem is detected.
  • NET-911 is only concerned about the existence of the file.
  • File Name to Trigger Power ON This unique NET-911 feature pe ⁇ nits a Drv: ⁇ directory ⁇ file name to be specified that when detected by NET-911 causes power to be turned ON to any device(s) receiving power from this module.
  • the specified file is detected by NET-91 1 , it is deleted before the power ON action occurs to prevent infinite power ON actions.
  • the contents of a power ON trigger file does not matter.
  • NET-911 is only concerned about the existence of the file.
  • Daily Scheduled Reboot Times the devices connected to a NET-911 module may be rebooted on a time scheduled basis up to three times per day.
  • Daily Scheduled Power OFF Times the devices connected to a NET-91 1 module may be have their power turned OFF on a time scheduled basis up to tliree different times each day.
  • Daily Scheduled Power ON Times the devices connected to a NET-911 module may be have their power turned ON on a time scheduled basis up to tliree different times each day.
  • Module Information this status section of the settings Window contains additional information about the module which cannot be updated. A description of each of these status items is as follows: a.
  • Position Cu ⁇ ent The cu ⁇ ent physical position of the module on the module daisy chain.
  • Position Previous The physical order (position) the module was at the last time the module daisy chain was polled.
  • Power Status Indicates if power is ON or OFF to any devices connected to the module.
  • Serial Number This field contains the module's serial number as assigned by the factory.
  • Firmware Version This is the hardware/firmware version of the module and the modules operating system
  • f. Module Type Indicates if the module is Single Break module or a port on a Multi-Break module.
  • the Pass_Through button 122 clears any active module and places the module daisy chain into a Pass-Through mode where any serial communications pass through to any device connected directly to the data-out port of the module at the end of the chain.
  • the Repoll button 123 repolls the module daisy chain and refreshes the module list box.
  • the Active Module status box 124 at the bottom of the List of Active Modules window contains the cunently active module. If no module is current active, this status box contains "No Modules Active - Pass-Through Mode.”
  • the Module System Configuration menu ( Figure 27) option pe ⁇ nits changing parameters applicable to all module processing as follows:
  • Require Reasons for Power OFF Actions Checking this box causes users to provide a reason whenever they reboot or turn OFF power to any device connected to a NET-91 1 module.
  • the reason entered may contain two lines of 50 characters per line. The reason entered is saved in the KEY- VIEW Event Log. If this check box is cleared, reasons for power OFF action will not be requested.
  • Require Reasons for Power ON Actions Checking this box causes users to provide a reason whenever they turn ON power to any device connected to a NET-911 module.
  • the reason entered may contain two lines of 50 characters per line. The reason entered is saved in the KEY- VIEW Event
  • Reboot Delay in Seconds This option sets the number of seconds that power will be temporarily shut OFF to the device connected to an active module whenever the Reboot option is selected from the Module Processing Settings window. The factory default for this option is 20 seconds, which should give any disk drives on the device time to spin- down before power is automatically restored.
  • Module Daisy Chain COM Port This menu option designates the COM port that NET-911 uses to access a module daisy chain. For PCs with only one module daisy chain, this setting only needs to be set once. NET-911 modules are installed on COM1 to COM 4 and should not share an IRQ with any other device.
  • a DOS-based program is created when the DOS version of the NET-911 Control Module software is installed and may be initiated using command line parameters.
  • This DOS based approach may be more convenient for use by third party monitoring application instead of using the NET- 911 32-bit Scheduled Event approach discussed above.
  • NET-911 modules may be accessed by any other third party application and power cut or restored to modules automatically when necessary.
  • the following DOS commands can be executed:
  • NOLOGO Omits the logo screen on startup.
  • NOMSGS Eliminates messages from command line functions.
  • COUNT Returns the number of attached modules.
  • command line format "N9MODDOS login:2 power:0 logout” will cut power to module position number 2 and restore the daisy chain to a pass-through mode.
  • a NET-911 module can handle any 110 volt devices with a total power consumption up to 10 amps. Some laser printers require as much as 10 amps of power periodically. Normally, most PC configuration require less than 5 amps of power.
  • a module may be disconnected from the daisy-chain at any time without affecting the power status of other modules on the chain. If a module removed from a daisy-chain is not the last module on the chain, any re-connect any remaining modules should be reconnected to the daisy-chain. If a module is removed or added to the chain, the sequence number assignments of some or all of the modules may change and should be re-verified by the Module Management Software described later to insure that each module is co ⁇ ectly described in relation to its (i.e.
  • pcAnywhere when pcAnywhere is rrinning in Host mode, pcAnywhere should be assigned the necessary priority as a background task to communicate with the remote client PC.
  • any device accessed in a serial "Pass-Through" mode at the end of the daisy-chain may temporarily interfere with the Module Management Software's ability to detect the modules present on the daisy-chain. This occurs because the device at the end of the chain may also be polling while it is waiting for a connection. In this case, additional modules may appear on the chain, if this should occur, the daisy-chain can be re-polled to remedy the issue.
  • each module 80 There are three status lights on the front of each module 80.
  • the pu ⁇ ose of each of these lights is as follows: Power In When lit indicates the NET-911 Control Module is receiving AC power through the module's power cord. Power Out When lit indicates the module is passing AC power to the POWER-OUT receptacle on the back of the module.
  • the NET-911 Module ACTION button is located next to the "Power Out” indicator light on the front of the unit. A pen or pencil point may be used to press this ACTION button to manually cause AC power to the device connected to the module to switch from ON to OFF or vice-versa.
  • KEY-VLEW security If KEY-VLEW security is enabled, a user must have supervisor access rights to access the NET-91 1 Module Configuration settings.
  • System permits specifying (1) the number of login attempts allowed by a remote user, (2) an optional expiration period for passwords, (3) the nrinimum characters required for a password, (4) how often the KEY-VLEW PC should beep when a remote user is accessing the KEY- VIEW PC, and (5) an event timer that permits either automatically logging out users or automatically switching from a Menu Mode to a Host Mode if no activity is detected for a user specified number of minutes .
  • Caller ID - permits requiring remote users to have a caller ID and further optionally restricting remote user access to only designated caller ID numbers
  • the KEY- VIEW PCs Access Control card captures each caller's ID.
  • the KEY- VIEW PC may be configured to lock out users who are not calling from designated numbers and/or who have intentionally blocked their caller ID.
  • Pager Alerts Permits issuing alerts to one or more pagers whenever a user fails to successfully Login to KEY- VIEW within the allowed number of password guesses.
  • System Backup Pe ⁇ nits saving any KEY- VIEW configuration changes made or restoring configuration files from backup files automatically created weekly by KEY- VIEW.
  • Event Log - permits viewing the KEY- VIEW event log which tracks a remote users use of the KEY- VIEW system and access to KEY-VLEW cards as a supplement to the pcAnywhere event log.
  • This date/time stamp log shows the user's login information, if applicable; caller ID information; when the KEY-VLEW application processing was initiated or terminated; any switching that occu ⁇ ed between PCI cards; and a log of any changes made to the User Security, System
  • Change Password - permits a user who has successfully logged in to change their password.
  • Logout - permits a user to Logout of the KEY- VIEW application.
  • the KEY- VLEW PC issues audible beeps or .way file sounds to notify Host site personnel when a remote user is accessing the KEY- VIEW PC.
  • audible alert sounds can be amplified to desired volume levels by installing an optional sound card in the KEY- VIEW PC. This approach insures on-site personnel can clearly hear that someone is remotely accessing the KEY-VLEW PC.
  • any on-site user cunently logged into the KEY-VLEW system will be automatically logged out should another user access the KEY-VLEW PC remotely.
  • This feature prevents a situation where a on-site user forgets to logout giving a remote users the opportunity to assume the on-site user's identity.
  • KEY-VLEW will automatically logout the remote user upon tennination of any remote access session. Again, this approach precludes someone else from assiiming the Login LD of a remote user who has terminated access.
  • the KEY- VIEW users security supports defining two classes of users namely supervisory and regular (non-supervisory users). Supervisory users have full access to all Host PCs and KEY- VIEW security and configuration settings. Regular users cannot change any KEY-VLEW security or system settings (i.e. the main menu options are grayed-out). In addition regular users may be restricted as to which KEY- VIEW PCI cards or NET-911 Control Modules that they may not access.
  • KEY- VIEW Security also permits defining KEY- VIEW users, passwords, supervisory authority, and access rights to KEY- VIEW PCI cards. In order to access this menu item either (1) security must be disabled or (2) the user cunently logged into KEY- VIEW must have "Supervisory” rights.
  • the ENABLE SECURITY check box determines whether
  • KEY- VIEW security is enabled (box checked) or disabled (box cleared).
  • KEY- VIEW When security is enabled, anyone attempting to access the KEY- VIEW application either remotely or on-site must first Login using a valid user ID and password. Before KEY- VIEW will permit security to be enabled, at least one user must be defined with supervisor access rights.
  • the Add User button permits a new user to be defined.
  • the Change User button is similar and pe ⁇ nits a previously identified user profile to be edited. When selected, a dialog box appears requesting the following information for the new or changed user:
  • User Name - defines a user name up to 25 characters long.
  • Password - A password may be up to 15 characters long. All passwords are internally encrypted by KEY-VLEW.
  • “supervisor rights” meaning the user has full access to all KEY-VLEW systems settings including the ability to enable/disable security, add or delete other users, or change user's passwords. If this box is not checked, the user's will be classified as a "Normal” user. A Normal user's access rights may be restricted to only designated KEY- VIEW PCI cards and NET-911 control modules. Normal users cannot change systems setting, add users, disable security, etc. Force Password Change - When this options is checked it forces the user to change their password the next time they login.
  • Non- Supervisor KEY-VLEW PCI Card Access Rights - Designates up to 8 PCI cards may be installed in a KEY-
  • Non-Supervisor VLEW PC that normal (i.e. Non-Supervisor) users may have access. Users who have their Supervisor Rights box checked automatically have rights to all PCI cards.
  • Non-Supervisor NET-911 Module Access Rights - Up to 250 NET-911 Control Modules may be connected to the serial port of a KEY- VIE W PC to control AC power and serial access to devices connected to the modules. No ⁇ nal (i.e. Non-Supervisor) users, may be prevented from accessing designated module numbers (i.e. positions on the module daisy chain). Users who have their Supervisor Rights box checked automatically have rights to all NET-911 Control modules connected to the PC.
  • the daisy chain Before restricting user access to designated modules, the daisy chain must have been previously accessed so that KEY- VIEW can identify the COM port to which the module daisy chain is connected. This is necessary because, in rare cases, it is possible that a customer may have more than 1 NET-911 module daisy chain connected to different serial ports of the KEY-VLEW PC. If user access will be restricted in such cases, it will be necessary to access the daisy chain (i.e COM port) where module access is to be restricted immediately prior to entering any user module access restrictions for that daisy chain. In other words, KEY- VIEW automatically associates any newly specified user module access restrictions with the last COM port where modules were successfully accessed.
  • the User Delete button causes the highlighted user to be deleted. An "Are You Sure?" message will pop up to confirm that the user should be deleted.
  • a System Security Settings dialog box permits specifying the number of unsuccessful log in attempts allowed by a remote user, criteria for the expiration of passwords, criteria for automatically logging out users, the minimum size for passwords and caller ID requirements.
  • Enable Password Expiration This feature forces users to periodically change their passwords.
  • Remote Session Beep Interval This feature alerts users at a
  • Host site whenever someone is remotely accessing the KEY- VIEW PC by causing the KEY- VIEW PC to beep at periodic intervals.
  • Enable Minimum Password Length This feature sets the minimum number of characters required for a user password.
  • Enable Inactivity Timer This setting is used to initiate one of two possible actions in the event "user activity" is not detected for a user specified number of seconds. User activity occurs whenever (1) a menu option is selected or an OK/CANCEL button is clicked while in a Menu Mode, or (2) any keyboard input occurs while in a Host Mode When this check box is checked, the specified action will be taken after no activity for the period specified in NUMBER OF MINUTES entry.
  • the NUMBER OF MLNUTES setting may be any value between 1 and 99 minutes. The possible actions that may occur in the event no activity is detected for the specified number of minutes depends on which Timer Option button is marked as follows:
  • Automatic Logout This option handles cases where users forget to log out when they are done, leaving the system open for possible security breaches by unauthorized persons.
  • KEY-VLEW automatically logs out any user after the NUMBER OF MINUTES specified, whenever there is no activity for this period of time. Immediately prior to logging out a user in this manner, a message box will be displayed giving 20 seconds to abort the log out process. If this automatic logout feature is enabled, but User Security has not been activated, the setting will be ignored, since users are not required to LOGIN.
  • Automatic Switch to Host Mode This option only applies when the KEY- VIEW PC is in a Menu mode.
  • KEY- VIEW It is designed for customers who want the KEY- VIEW PC to automatically default to a Host Mode so that users do not have to bother switching from a Menu Mode to the Host Mode whenever they initially access the KEY-VLEW PC (because a previous user left the KEY-VLEW PC in a Menu Mode).
  • KEY- VIEW will automatically switch to a Host Mode, whenever there is no activity for the NUMBER OF MLNUTES specified. If no Host PC is active at the time this automatic switch occurs, an appropriate e ⁇ or message is displayed and no switch to a Host Mode occurs. Immediately prior to switching to a Host Mode in this manner, a message box will be displayed giving 20 seconds to abort the switching process.
  • the Site ID menu option permits assigning the KEY- VIEW PC an up to 8 character Site name.
  • the pu ⁇ ose of the site ID is to permit each of the event logs stored within each remote KEY- VIEW PC to be consolidated into a central company wide event log file.
  • Event Log stored in the PC can be automatically transfened to the remote site by setting the "Auto File Transfer" file option of pcAnywhere to transfer the file immediately after logging into the site. When this transfer is initiated.
  • pcAnywhere automatically transfers (using it's file synchronization feature) only the records that have been added to the KEY-VLEW PC since the last file transfer to the remote site.
  • the KEY-VLEW PCs Access Control card can capture each caller's LD.
  • the KEY-VLEW PC may be configured to lock out remote users attempting to connect to the KEY- VIEW PC (via modem) who are not calling from a pre-authorized phone number or who have intentionally blocked their phone number (i.e. their caller ID). If this caller ID service is installed, KEY-VLEW automatically captures the caller ID received from any incoming call and logs the caller ID information in the KEY- VIEW Event Log, even if none of the additional security features discussed in this topic are activated.
  • New caller ID phone locations can be added by specifying the phone number for the location to be authorized.
  • the following fields are required:
  • Phone Number - Describe the location where the phone number specified is physically located. This description must be 40 character or less. Phone Number - Enter the phone number that is authorized to remotely access this KEY-VLEW PC via modem. This phone number must include an area code and be formatted exactly as reported in the KEY- VLEW log.
  • KEY-VLEW may be configured to issue pager alerts to one or more pagers announcing that a potential intruder has been detected.
  • a modem Prior to implementing this feature, a modem must be connected through a NET-911 Module to the KEY- VIEW Access Control Card as more fully discussed with respect to the Access Control Card 90 of Figure 12.
  • the modem connected 81 may be used to dial the pager alert phone calls and to enter a password to remotely reboot the KEY-VLEW PC.
  • the Pager Alert Settings include: a. When enabled, the Pager Alert issues a page in the event (1) a caller LD violation occurs (see Caller ID topic) or (2) KEY-VLEW security is enabled and a user fails to login to KEY- VIEW within the allowed number of attempts and is put in a Lock-Out status (see System Security Settings topic).
  • pager alerts are not re-issued in the event a user who is "locked-out" of KEY- VIEW attempts to login again after being locked out.
  • All persons or locations to be paged in the event an authorized user is detected are included in a list. When an unauthorized intruder is detected, all persons on this list will be paged,
  • New persons to be paged can be added by entering a description of the person or location where the pager number specified is physically located and the Pager Phone Number and Alert Code.
  • the pager alert code specified should first clearly identify to the NET-911 administrator receiving the page that it is a KEY- VIEW alert. A code prefix of 911 can be used for this pmpose.
  • This code can be followed by a Site ID number to uniquely identify the KEY-VLEW PC that is issuing the alert.
  • the code can end with the phone number used to access this modem.
  • Changes can be made to the page alert list by editing the information described above in section c.
  • KEY- VIEW administrator When a KEY- VIEW administrator receives a pager alert, he or she should access the KEY- VIEW PC that issued the page (either remotely or on site) and review the end of that site's event log to determine why the page was issued.
  • Each pager alert takes about 70 seconds to complete. No activity occurs on the KEY-VLEW PC until all specified pager alerts are delivered. So, the number of pager alerts should be kept to a minimum, to prevent the possibility that an administrator can access the log while pages are being issued. A pager alert will not be delivered if the number being called is busy.
  • This menu option permits (1) encrypting and saving the cu ⁇ ent status of any KEY-VLEW configuration changes made or (2) restoring the KEY-VLEW configuration from backup in the event
  • KEY- VIEW files become corrupted.
  • KEY- VIEW configuration changes can be optionally stored to permanent disk storage.
  • the system backup routine maintains a list of configuration backup files saved by KEY-VLEW. Each time a KEY- VIEW menu option is selected, KEY-VLEW checks the cunent date against the date that the system configuration was last backed up and automatically backs up the configuration if more than 7 days have elapsed. Up to one year of configuration files are maintained by KEY- VIEW in this manner.
  • the cu ⁇ ent status of the KEY- VIEW configuration is encrypted and saved to disk. Thereafter, a selected backup file can be restored as the cu ⁇ ent KEY- VIEW configuration.
  • Event Log The Event Log option on the KEY- VIEW Security menu is a unique feature that keeps a record of all Keyview II activity and permits viewing the KEY-VLEW activity at a later date. This log contains date/ time stamped entries tracking all aspects of user access to KEY- VIEW Host PCs as well as changes made by users to the KEY- VIEW system configuration.
  • the KEY- VIEW Event Log shows the user's login activity, if applicable; caller ID information; when the KEY-VLEW application processing was initiated or terminated; any switching that occuned between PCI cards; and a log of any changes made to the User Security, System Security, or Caller ID security settings or other system configuration settings.
  • the Event column contains a brief 1 line description of each event that occuned. Some of these lines may be indented. Indented lines mean the event relates to a preceding event line. For example if a user connected a switch box to a KEY- VIEW PCI card that was previously connected to a PC, the user would change the PCI card's setting from "Switch Box" to "PC". This event would then cause other events to occur namely the deletion of any video drivers and mouse drivers associated with the PC that was formally directly connected to the PCI card. These resulting events would then appear on the log indented and immediately following the event that noted the setting change from '"Switch Box" to "PC".
  • the Mouse menu bar option of Figure 13 pe ⁇ nits creating and listing mouse drivers, that are used to control Host PC mouse movements and synchronize the Host PCs mouse position with the KEY-VLEW PC's mouse position. In cases where Host PCs does not need mouse support or the special KEY-VLEW mouse driver has been installed on the Host PC, this menu option will not apply. Before discussing the process for creation of a mouse driver, it is important to understand why a mouse driver needs to be created.
  • the KEY-VLEW PC's PCI card must process video output data from the active Host PC before displaying the video screen on the KEY- VIEW PC.
  • the slight delay resulting from this processing causes the Host PC's mouse pointer to appear to trail behind the KEY- VIEW PC's mouse pointer as a shadow. This delay is even longer for a remote user, because the Host screen data must be processed a second time by the pcAnywhere application to transmit the screen data to a remote user.
  • the KEY- VIEW PC's mouse pointer When the KEY- VIEW PC's mouse pointer is properly synchronized with the Host PC's mouse pointer (i.e both pointers converge whenever mouse movement stops), the KEY- VIEW PC's pointer represents the true position of the mouse on the Host PCs screen and the shadow can be ignored. Because two pointers appear on the screen during mouse movements, it can become confusing.
  • This problem can be avoided by either using the mouse configuration setting on the Host PC to blank out the Host PCs or use the Windows 95 mouse pointer control panel option to change appearance of the KEY-VLEW PC's mouse pointer to be different from the Host PC's mouse pointer, so users are able to tell which mouse on the screen is the KEY-VLEW PCs pointer vs. the Host PC's pointer.
  • a mouse pointer in the shape of a FOX is provided with KEY-VLEW II.
  • the main problem in this synchronization process is that an application running on the Host PC could cause the mouse position to jump to a new location causing the KEY- VIEW PCs mouse to be out of sync with this new location. Other synchronization problems would result if someone changed the mouse acceleration factors on the Host PC.
  • the main problem when the mouse positions become unsynchronized is that it is impossible to move the Host PC's mouse to all positions on the screen using the KEY- VIEW PC's mouse.
  • the KEY-VLEW PC's mouse pointer becomes unsynchronized to the left of the Host PC's mouse pointer it would be impossible to move the Host PC's mouse to the left edge of the screen because mouse movement data on the KEY- VIEW PC would no longer occur (i.e., detected by the application running on the Host PC) when the KEY-VIEW PC's mouse reached the left edge of the screen.
  • the KEY-VLEW PCs mouse pointer In order to keep the KEY-VLEW PCs mouse pointer synchronized with the Host PCs mouse pointer several approaches are possible.
  • a special mouse driver provided with KEY- VIEW II would be installed on the Host PC in place of the Host PCs mouse driver. This approach allows this mouse driver to communicate with the KEY-VLEW PC application to insure all mouse movements are always synchronized.
  • a special KEY-VIEW mouse driver must be created on the KEY- VIEW PC when the Host PC is defined for access by the KEY- VIEW.
  • the creation of this mouse driver is a simple task.
  • any special mouse options set on the Host PC to (1) change the mouse sensitivity or acceleration factors, (2) change the click speed or (3) permit automatic jumping to a specific location (e.g. a highlighted button of a new dialog box) must be disabled. Any such feature that are active on the Host PC will cause the Host PCs mouse to become out of sync with the KEY- VIEW PC's mouse, making mouse control of the Host PC difficult or impossible.
  • Another approach uses a specially colored and/or drawn mouse pointer, that could be trapped by looking for the pointer on the video screen data captured from the Host PC.
  • a special software in the KEY- VIEW PC specifically looks for a situation where the mouse reaches any edge of the screen. When this occurs, the software continues to transmit mouse movements (mickeys) in that direction to the Host PC until the mouse on the KEY- VIEW PC was moved off of the edge of the screen.
  • This embodiment solves the problem where the mouse position on the KEY- VIEW PC becomes unsynchronized with the mouse position on the Host PC so that the mouse cannot be moved to the end of the screen as previously discussed in an example above.
  • a variation of this embodiment captures raw mouse movement data directly from the mouse itself.
  • the prefened approach identified for mouse synchronization appears to be writing a mouse driver to be installed on the Host PC that captures the mouse's cu ⁇ ent position on the Host PC screen and feeds this position back to the KEY- VIEW PC tlirough either a serial or PS-2 mouse interface cable, depending on what type of mouse interface had been used for the Host PC.
  • the mouse driver written is designed to replace any mouse driver cunently installed on the Host PC.
  • the KEY- VIEW mouse driver is designed for two way communications between the Host and KEY- VIEW PCs.
  • exact X/Y co-ordinates are sent to the Host PC from the KEY- VIEW PC that cause the Host PCs mouse to jump the specified coordinate, as if the mouse had been told to jump to that co-ordinate by an application on the Host PC.
  • a Host or Remote site user clicks their mouse button the exact X/Y co-ordinate and button that was clicked is transmitted to the Host PC in a single data packet.
  • the button clicked segment of the packet is set as a null value, so that all packet formats sent are consistent.
  • Any packet sent to the Host PC by the KEY-VLEW PC must be acknowledged via a typical serial ACKINAK protocol. Packets not acknowledged by the Host PC that do not include mouse click information may be dropped by the KEY- VIEW PC in favor transmitting any more recent X/Y coordinates packets in the KEY- VIEW PCs buffer.
  • the KEY-VLEW mouse driver is designed to service all required functions of a typical mouse, but ignores most typical requests by Host PC applications to change mouse functionality. For example, requests to (1) change the mouse sensitivity or acceleration factors, (2) change the click speed or (3) implement a feature to permit automatic jumping to a specific location (e.g. a highlighted button of a new dialogue box) are acknowledged like a normal mouse driver, but ignored and hence have no impact on mouse movements. In any case where one of these mouse features is ignored by KEY-VLEW, if possible, the application (e.g. Windows) that requested the change is notified that the option is not supported by the KEY- VIEW driver. This pennits the application to notify the user that the feature is not supported.
  • the application e.g. Windows
  • KEY-VLEW mouse driver special routines support the essential functional requirements of a mouse in cases where a Host application cannot be told the function is not available. For example, as a result of a KEY- VIEW PC's mouse movement/click packet, the application on the Host PC may have the right to call the -mouse driver and cause the mouse to jump to another location on the screen. If the application cannot be told at the time of the request that the jump function is not supported, the mouse driver must accept the jump. In this case, the jump movement is ignored and discarded by the mouse driver and the pointer left at it's cu ⁇ ent location.
  • the prefened embodiment does not provide mouse support for such applications.
  • the KEY-VLEW Host PC mouse driver simply does not update mickey movements whenever X/Y co-ordinate changes are received from the KEY- VIEW PC. This approach could create a problem where a Host PC application starts with a mouse pointer in the middle of a screen and the user has no way to move the mouse pointer out of the way.
  • a special packet could be sent to the KEY-VLEW mouse driver with a xfy co-ordinate of 9999/9999, that would tell the driver that the Host PC has just been accessed by KEY- VIEW and to send an excessive number of mickeys to the cunent application to force any mouse pointer relying on mickeys to move to the bottom, right corner of the screen, which is the normal place most typical slanted mouse a ⁇ ow pointer would disappear from the screen.
  • This packet would also cause the mouse pointer to be positioned in a consistent place in the middle of the screen for those normal applications that rely on X Y co-ordinates.
  • the Host PC's KEY-VLEW mouse driver is capable of detecting applications that rely on mickey input for movement, which is probably unlikely, then the driver returns a special packet back to the KEY-VLEW PC that alerts the user that mouse movements are not supported for the cunent application.
  • Developing special KEY-VLEW mouse drivers for installation on Host PCs is the recommended approach. This assures that the Host PC's mouse movements will occur on a real time basis and the KEY-VLEW PCs mouse pointer will reflect actual position of the mouse on the Host PC's screen.
  • a minor problem will occur when a Host PC is accessed by a Remote PC because, due to screen refresh delays, the Host PCs mouse's image will lag behind the KEY- VIEW PC's mouse's cu ⁇ ent position. In such cases the user will be instructed to simply ignore the Host PC's mouse image, which will have a different pointer appearance, because the unique KEYVIEW mouse pointer will be installed on the KEY- VIEW PC. In any event, dual mouse pointers cannot be simply solved by blanking out the Host PCs mouse pointer because the Host PCs mouse pointer will need to be visible to a user at the Host site viewing the Host PC's screen from the video output port of the KEY-VLEW PCI card. Alternatively, the Host PC mouse can be cloaked and then restored as necessary under program control.
  • the KEY- VIEW PCs mouse pointer could be setup to use a blank (null) pointer which would cloak the pointer whenever the KEY- VIEW PC was in a Host mode.
  • the KEY- VIEW PC's pointer would be restored when switching back to a Menu mode.
  • any mouse movements from either the KEY- VIEW or remote PC's mouse would have to be transmitted to the Host PC even when the true pointer's position was at the corner of the host or remote PC's screen. This is a good approach, but is not presently feasible.
  • pcAnywhere stops transmitting mouse movement data to the Host site whenever the mouse reaches or passes the boundary of the KEY-VLEW PC's window on the remote PC.
  • the Host PC's mouse is at the bottom of the screen and the KEY- VIEW PC's mouse is at the top of the screen boundary when the KEY- VLEW PC is first accessed; there will be no way to move the Host PC's mouse pointer up from a remote PC.
  • a trick to grab the Host PCs pointer by using a "hot key" to temporarily suspend the transmission of mouse movement data would require a visible pointer on the Host PC and would only work temporarily due to differences in mouse sensitivity and acceleration as discussed below.
  • PC's pointers will eventually synchronize is to install a unique mouse pointer on a Host PC.
  • This technique is herein refened to as the "unique pointer" approach.
  • the KEY- VIEW or PCI APP could always detect the exact cunent location of this unique pointer on the Host PC via scanning the Host screen differencing file.
  • the KEY- VIEW APP must be able to determine the exact position of the mouse pointer's hot spot by analyzing the Host PC's screen display data.
  • the unique pointer concept requires that the Host PC's mouse pointer's shape, color(s) and location of the hot spot (which is a single pixel) be pre-defined.
  • the PCs mouse driver Insures the hot-spot remains within the screen area.
  • the hot spot is at the tip of the standard a ⁇ ow pointer, so when the a ⁇ ow is positioned at the lowest, right most section of the screen, the pointer appears to disappear. But, in fact the hot spot's pixel is positioned at the very edge of the screen.
  • the color pattern selected should include only the least distortable primary colors of red, green and blue with a white pixel hot spot.
  • the following pattern is suggested - B R C B R G W C R B G R B. On this basis if either the horizontal pixel pattern B R C B R C W or W G R B G R B was detected while burlding a block the Hot spot would be the location of the W pixel.
  • the process of detecting where the mouse was positioned may be processing intensive which may either significantly increase the cost the PCI card's hardware or slow down KEY- VIEW APP processing on the KEY- VIEW PC depending on where the pointer detection frmction was perfo ⁇ ned.
  • the Host PC's mouse would be kept synchronized with the KEY-VLEW PC's mouse position by properly controlling mouse data input to the Host PC via the KEY- VIEW PC's PCI card. Synchronization would be accomplished by training the KEY-VLEW PC to understand the exact effect that mouse movements would have on the Host PC.
  • Mouse driver software supplied with the mouse can be used to change the sensitivity of the mouse connected to the PC. When the mouse sensitivity is low, it will take greater physical movement by the mouse to move the pointer on the screen. A mouse's movement causes a fix number of "clicks" to occur for a given distance. When the sensitivity is lowered, the mouse driver reading the mouse clicks requires more clicks to move the mouse on the screen a given distance. Data to move a mouse on a screen is often refened to as "mickeys"
  • the mouse's pointer position of the Host PC could be automatically synced to the mouse's pointer position of KEY- VIEW PC simply by sending excessive mouse movement commands to the Host screen to force the mouse to move to position 0,0 regardless of where it is cunently positioned (e.g. stuff 1024 movements up by 768 movements left into the Host PC's mouse interface cable). Then, mouse movements could be transmitted and tracked to move the mouse from it's known position 0,0 to it's cu ⁇ ent location on the KEY-VLEW PC.
  • the mouse sensitivity of a Host PC is set differently than the mouse sensitivity of the KEY- VIEW PC, as controlled by pcAnywhere, when a remote user moves their real-time (remote) mouse, the Host PC's mouse (as shown on the captured Host screen) will not stay in sync. Because it is highly unlikely that the sensitivity of a remote PC's mouse will be set the same as a Host PCs mouse, it will not be possible to have real-time synchronization between the Host and KEY-VLEW PCs because the difference must be calculated and tracked.
  • Option 1 is preferable because it assures the Host and KEY- VIEW PC's mice will always be accurately synced in the shortest period of time using the mimmum amount of processing.
  • Option 2 may cause major delays in moving the Host PC's mouse to align with the KEY- VIEW PC's mouse and could involve tedious user controlled trial-and-enor mouse speed adjustment settings.
  • This approach has the major benefit of avoiding any delays on waiting for the video feedback required in the unique pointer approach, because the driver has the necessary information to predict where the Host PC mouse is positioned.
  • the driver has the necessary information to predict where the Host PC mouse is positioned.
  • the Host and KEY-VLEW PC mouse pointer may become permanently out of sync.
  • some applications running on the Host PC may issue a command to the Host PC's mouse driver to tell it to jump to a given co-ordinate. If this were to occur, the KEY-VLEW PCs would become totally out of sync with the Host PC.
  • KEY- VIEW could also support cases where a user (using the unique pointer approach) elects not to create a mouse driver. However, as mentioned host PC's pointer movements will likely be far more jumpy that using both the unique pointer and mouse driver approaches. In cases where a unique pointer is not installed, the Host user would be required to create a mouse driver for the Host PC as described below and insure acceleration is disabled. Otherwise, the Host PCs mouse will not stay in sync with the KEY- VIEW PCs mouse.
  • the KEY- VIEW APP will always know the cunent, exact, X/Y co-ordinate position of the KEY-VLEW PC's mouse pointer regardless of mouse sensitivity differences between the remote and KEY-VLEW PC's mouse settings.
  • the trick is to sync this known position precisely with the Host PC's mouse position. As mentioned, this becomes complicated because the Host PC could be set to any one of a numerous different sensitivity settings and the pointer could be anywhere on the screen when the Host PC is initially accessed.
  • the objectives would then be to (1) dete ⁇ nine the Host PC's sensitivity setting and store this setting as a driver file for that Host PC and (2) force the Host PC's mouse to a known position (e.g. position 0,0) after a Host PC is initially accessed.
  • a known position e.g. position 0,0
  • KEY- VIEW will need to save multiple mouse drivers for a Host PC similar to how the KEY-VLEW design now provides for saving multiple video drivers for a Host PC.
  • creating a mouse driver must be done so as not to require software resident on a Host PC. This is a requirement because a Host application that could set sensitivity will not likely support running a mouse training program while the application is running.
  • KEY-VLEW mouse driver To create a KEY-VLEW mouse driver the user will need to select one of the four comers of the screen where there is no video movement (e.g. blinking cursor) within the comer selected.
  • the Host PC After a Host PC was properly setup in this manner, the Host PC would be selected as the active PC on the KEY-VLEW PC via the KEY- VIEW APP. Then, a new menu option would be selected that would prompt the user to select in which of the four comers of the screen the Host PC mouse pointer was cunently located.
  • the KEY-VLEW APP would then cause excessive mickeys to be sent to the Host PC to force the mouse pointer's hot spot to the comer's edges of the-screen.
  • the KEY-VLEW APP / PCI APP would test for several seconds that no video differences were reported in that comer (from the PCI video capture circuitry) within that 1 " x 1 " area. If differences were reported, an applicable e ⁇ or message would be displayed for the user and the mouse driver generation process terminated. Otherwise, mickeys would be counted and transmitted to the Host PC until the pointer moved 10 pixels (right) horizontally from its cunently location and then counted again to the left until the pointer returns to it's original position. The same process would then be repeated vertically up, then down. At the end of this testing, a driver file would be created containing the exact number of mickeys per pixel required to move the Host PC's mouse right or left vs. up or down.
  • the exact shape of the pointer could be determined by moving the pointer at least 20 pixels diagonally from the comer edges of the screen using the new mouse driver information. Since a cursor can be no more than 16 pixels, this approach assures the entire cursor is visible. Next, a check sum would be computer for a 50x50 pixel area cover the entire area of the screen where the pointer is now located. Then, mickeys would be sent by the KEY-VLEW PC using the new mouse driver data to move the cursor around the entire screen at a rapid rate for several seconds at the end of which the pointer would be returned to it's exact starting location.
  • a second check sum would be calculated on the same 50x50 area. If the two check sums did not agree, it would mean that training failed because either mickeys were lost in transmission or the mouse on the Host PC had an acceleration factor. In this event, the test could be automatically repeated using a slower rate of transmission of mickeys to the Host PC to determine that point at which a driver could be reliably be generated. Then, the user would be advised of need for a speed reduction as well as the reduction factor required. This mouse speed factor would need to be included in the mouse driver file. The presence of a mouse acceleration factor on the Host PC or mickeys dropped in transmission could make it impossible to create a mouse driver for the Host PC. In this case an enor message would be displayed requested the user to check if acceleration has been disabled and suggesting the use of the unique -mouse approach.
  • a warning message would be displayed advising the user that the driver had been successfully created, but that any changes made to the mouse sensitivity or acceleration settings after the driver was created would cause the Host PC's mouse to become out of Sync with KEY-VLEW PC's mouse and preclude proper remote mouse control.
  • the message would also advise the user to re-run training for any other applications on the Host PC that may change the mouse sensitivity setting, which should be a rare occunence.
  • the cunent location of Host PC's mouse pointer image will always lag behind the mouse pointer cu ⁇ ent position on the KEY- VIEW PC or remote PC. This occurs because of the delay required to display a Host PC's screen on the -KEY-VLEW PC. As a result of this lag, a KEY- VIEW user will see two mouse pointers on the screen when the mouse is being moved.
  • the KEY- VIEW APP must automatically sync the KEY-VLEW mouse with the Host mouse by sending excessive mickeys to the Host mouse to insure the Host mouse is moved to position 0,0. Then, a vector would be computed to the cu ⁇ ent mouse position of the KEY-VLEW PC's mouse and the mickeys sent to move the Host mouse to that position thereby causing both mice to be synced, so that normal mouse processing could begin.
  • the KEY- VIEW Menu mode will provide an option to create a mouse driver.
  • each KEY-VLEW PCI card and Switch Box PC list will need to contain a field for updating the mouse driver file name associated with each PC connected to KEY-VLEW.
  • the "skip message” button is necessary for Host PCs, such as Novell servers that don't use a mouse. In this case, a user will not want to see an unnecessary message each time they access the PC.
  • the training button it will be important to have a "HELP” button that will use the text in this section to explain the mouse driver and pointer options that are available and permit the user to cancel training if they want to use the KEY- VIEW pointer option.
  • the KEY- VIEW Mouse bar option must be selected to create the necessary mouse driver.
  • Mouse Training This menu option is used to create a mouse driver for a given Host PC.
  • List Mouse Drivers This menu option is used to list and delete mouse drivers previously created and switch between mouse drivers previously created for the active Host PC. The above menu options will not be accessible in cases where the Settings for the cunently active Host PC indicate that the special KEY- VIEW mouse driver is installed on the active Host PC, the active Host PC doesn't need mouse support (see the Switch PC's topic for more information on how to set the mouse requirements for a Host PC), or no Host PC is active.
  • a Mouse Training menu option is used to create a mouse driver for a given Host PC.
  • the Host PC for which the mouse driver will be created must be selected as the active PC and the Mouse Driver option for the active PC must be set to use the Driver Name option, as discussed under Switching PCs above.
  • the operating system that nonnally uses the mouse should be running on the Host PC (e.g. Windows, OS/2. DOS etc.), so that the mouse is visible on the Host PC.
  • the Host PC must have a stable video image in approximately a 1 "x 1" area bounded by one of the four comers of the screen. In other words there should be no flashing cursor, color changes or movement in one of the four comers of the Host PC's screen.
  • a pop up menu appears, such as is shown by example in Figure 21 , requesting the selection of a stable comer of the active Host PC's screen.
  • KEY- VIEW will move the Host PCs mouse pointer to the designate comer of the screen to create the mouse driver. If other movement is detected during training or the mouse does not respond properly during testing, an appropriate e ⁇ or message will be displayed and the mouse driver will not be created. Otherwise, the mouse driver file will be created using the file naming conventions discussed under the Switch PCs menu option. Then, the mouse driver for the active PC will be automatically updated.
  • the mouse driver file contains values as exact amount of mouse movement needed to move the Host PCs mouse one pixel on the Host PC's X-axis and one pixel on the Y-axis.
  • the driver also contains a speed adjustment factor necessary to avoid any mouse acceleration settings on the Host PC. After mouse training is completed, processing will automatically return to the Mouse main menu bar option.
  • the List Mouse Drivers menu option displays a list box containing any mouse drivers created for the cunently active Host PC using the Mouse Training menu option.
  • KEY-VLEW associates each mouse driver file with a Host PC using the Host PCs unique number contained as part of each driver's file name.
  • the mouse driver list box contains the following info ⁇ nation for each of the active Host PCs mouse driver files:
  • Mouse driver files are created using the Mouse Training menu option. The required mouse driver file naming conventions are discussed under the
  • Mouse Driver processing options are as follows: Select - This button is used to change the default mouse driver used by the active host PC. When this button is selected, KEY-VLEW recorifirms the mouse driver file still exists in the KEY- VIEW directory. If the driver file cannot be located, an enor message is displayed and the selection is ignored. Otherwise, the highlighted mouse driver becomes the default mouse driver for the Host PC. If the driver selected is already the default, an appropriate e ⁇ or message will be displayed and the selected driver will remain the default driver. If the driver selected is not the default driver, the default driver is then changed. In this case, the active PC would then be using an inconect mouse driver, so KEY- VIEW automatically deactivates this Host PC. This Host PC can then be made active again with the newly selected mouse driver using the Switch PCs menu option.
  • this button can be used to re-synchronize the listed mouse drivers to the driver files that actually exist in the default KEY- VIEW directory of the hard drive. If a driver file can not be found for a listed mouse driver, that driver will be automatically deleted from the list. If a driver exists in the KEY- VIEW directory but is not on the list, an entry for that driver will be automatically added to the list. Messages will be displayed indicating the names of any mouse drivers that were added or deleted during processing. Status messages are also be displayed in the event no discrepancies are detected. Delete - Selecting this button causes the highlighted entry and associated driver file to be deleted.
  • the Video KEY- VIEW menu bar option of Figure 13 permits creating and listing KEY-VLEW video drivers that are used to display the active Host PCs screen on the KEY-VLEW PC. When selected, three menu options appear initiating video training for the active Host PC, listing and/or deleting video drivers that have been created, or setting the number of colors used when decoding the Host PC video output signal.
  • Each video card in a Host PC may generate video output signal that differs from other video cards.
  • the KEY- VIEW PC In order for the KEY- VIEW PC to properly decode the video output signal of a given Host PC, it must lock into the unique characteristics of the video card installed in the Host PC at each video resolution that Host PC may use. To lock on this signal, a known test pattern must be displayed on the Host PC's screen so that the KEY- VIEW PC can lock on to each pixel displayed and the properly inte ⁇ ret the color of the pixel during the training process so that an appropriate driver file can be created.
  • the KEY- VIEW PC can automatically detect the cu ⁇ ent graphics resolution for a Host PC and create the driver file required for that resolution.
  • KEY- VIEW supports various graphics resolutions ranging from 640 to 480 pixels to 1024x768 pixels. At higher graphics resolution the number of pixels that need to be inte ⁇ reted increase dramatically. As a result, more data must be decoded by KEY- VIEW causing it to take longer to capture a Host PC screen and transmit it to a remote user. Accordingly, it is suggested that Host PCs be set to the lowest acceptable graphics resolution to improve screen refresh rates for remote users.
  • Video KEY-VLEW menu bar option As mentioned, when the Video KEY-VLEW menu bar option is selected three menu options appear as follows:
  • Video Training Prior to selecting this menu option, the user must display a known full-screen graphics test pattern on the active Host PC. This menu option then creates a video graphics file for the active Host PCs cunent graphics mode (e.g. 640x480, 800x600, etc). If no Host PC is active or the other than the intended Host PC is active the required training file will not be created.
  • a known full-screen graphics test pattern e.g. 640x480, 800x600, etc.
  • This menu option is used to list and delete video drivers previously created and switch between video drivers previously created for the active Host PC. Colors - This menu options will pe ⁇ nit a user to specify the number of colors to be used to view a Host PCs screen.
  • Video Training Video Training is the first menu option displayed when the
  • Video option is selected from the KEY- VIEW main window bar. Prior to selecting the Video Training menu option, the user must display a known full-screen graphics test pattern on the active Host PC. This menu option will then create a video graphics file for the active Host PC's cu ⁇ ent graphics mode (e.g. 640x480, 800x600, etc.) of the Host PC.
  • the active Host PC's cu ⁇ ent graphics mode e.g. 640x480, 800x600, etc.
  • KEY-VLEW compares the known test pattern on the Host PC's screen to the actual video output received by the applicable KEY-VLEW PCI card to resolve pixel alignment problems that may prevent the Host screen from displaying accurately on the KEY- VIEW PC.
  • the KEY-VLEW training test pattern may be alternating black and white pixels that cover the entire screen. Three test patterns will be needed to cover the tliree supported graphics modes (i.e. 640x480, 800x600 and 1 024x768).
  • KEY-VLEW will load the training driver data into memory in a standard format and then will save the driver data.
  • the KEY-VLEW PC has the ability to detect that the required KEY-VLEW test pattern is being displayed on the active Host PC. If this pattern is not found when the training process is initiated, an appropriate e ⁇ or message will be displayed.
  • the List Video Drivers menu option displays a list box containing any video drivers created for the cunently active Host PC using the Video Training menu option.
  • the video driver list box contains 1): video driver disk data file location stored during the training routine; 2) the date the video driver file was created, 3) the time the video driver file was created; and 4) a description of the Host PC that uses the video driver file.
  • KEY-VLEW's Video main bar option a user can specify the number of colors to be used to view a Host PC's screen, namely 256, 16, 4, or 2 colors.
  • pcAnywhere's compression routines that will transfer data from a KEY-VLEW PC to a Remote PC (1) look for pixel changes on the screen, (2) break the screen up into sections to identify segments of the screen that have changed, and (3) give priority in posting changes in those sections of the screen that have most recently changed. pcAnywhere looks for changes beginning at the top left of the screen and moves from a left-to-right top-to-bottom approach.
  • the pcAnywhere approach helps the KEY- VIEW system optimize the transmission of mouse pointer movements to a remote user, which is a major area of concern.
  • Host PC screens are being refreshed at a tremendous speed (e.g. 70 frames per second).
  • the hardware design of the KEY- VIEW PCI card calls for capturing a different 32k section of the Host PC's screen during each screen refresh cycle.
  • the primary reason for breaking a screen up into 32k segments is not because the entire screen can't be captured during each refresh cycle, but is to minimize the need for expensive, high speed, static RAM chips that would be needed to store and analyze captured Host screen information between Host screen refresh cycles.
  • Increasing the captured block size would also have the undesirable effects of (1) requiring too much board space for RAM chips, (2) substantially increasing the cost of the PCI board, and (3) stressing the ability of the PCI buss to transfer the larger blocks.
  • the 32k approach does not represent a full screen at a any point in time and (2) the KEY- VIEW PC will only be processing screen data from the active PCI card and active Host PC (in the case of a switch box); KEY- VIEW will does not continually save the last several screens in cases where a Host PC has failed.
  • the Keyboard menu option on KEY- VIEW main menu bar has two sub-options as follows:
  • the Create /Send Keyboard Macro option permits naming and defining hot key sequences (e.g. Shift+Ctrl+End) that are sent to the active Host PC when the named macro is selected. Defining hot key sequences in this manner avoids the need for users to recall or enter the specified hot key sequence via the keyboard.
  • the Windows application mnning on the KEY- VIEW PC traps hot keys such as Ctrl+Alt+Delete or Alt-Tab before they can be sent to the active Host PC. For such cases appropriate keyboard macros have already been pre-defined.
  • Each KEY- VIEW PCI card contains a internal switch that safely emulates pulling a PC's keyboard plug thereby forcing the active Host PC's keyboard controller to reboot. This menu option simply invokes that switch and gives a KEY- VIEW user the power to attempt to unlock a locked up PC remotely without rebooting the Host PC.
  • the Create/Send Keyboard Macro option permits naming and defining keyboard hot key sequences (e.g. Shift+Ctrl+End) that are sent to the active Host PC when the named macro is selected. Defining hot key sequences in this manner avoids the need for users to recall or enter the specified hot key sequence via the keyboard.
  • the Windows application mnning on the KEY- VLEW PC traps hot keys such as Ctrl+Alt+Delete or Alt-Tab before they can be sent to the active Host PC.
  • appropriate keyboard macros have already been pre-defined. In rare cases it may be necessary to create a macro because
  • This menu option may be used to create or delete keyboard macros and to send a macro created to the active Host PC. Once a macro is created, that macro also automatically appears on any applicable KEY- VIEW menu option that involves sending keyboard macros to the Host PC.
  • These menu options include: (1) PCI Card Settings (Switch Box Hot Keys setting), and (2) Switch Box PC Settings (Switch Box ID).
  • Switch Box macros can be amended or selected independently, such as via the example menu shown in Figure 25. In Figure 25, a scrolling list (displaying 15 macros at a time) of switch box command macros related to the cunently active PCI card appears. If no strings have been defined for the active PCI card, the user would click on the Add button to permit a macro to be defined.
  • the command key sequence for the switch box must not be entered.
  • KEY- VIEW will automatically add the applicable command mode sequence before sending the macro and a ⁇ Enter> key after sending the macro.
  • the KEY- VIEW APP will associate a list of macros with a PCI card ID so that different macros can be assigned to each PCI card. If the cunently active PCI card ID is not defined as a switch box card (i.e. an SB as discussed under the SwPCs menu option above), a enor message will appear if this menu option is selected which will preclude any entry of macros for the PCI card. After either (1) an option is selected and the selected macro sequence sent to the Host PC, (2) the user presses the Esc key or (3) the user clicks on the cancel button processing will return to the Keyboard main menu option. From the Keyboard menu option, a user may use the a ⁇ ow keys/Enter key or mouse to select a menu option.
  • a switch box card i.e. an SB as discussed under the SwPCs menu option above
  • Each KEY- VIEW PCI card contains a internal switch that safely emulates pulling a PC's keyboard plug thereby forcing the PC's keyboard controller to reboot.
  • This menu option simply invokes that switch and gives a KEY-VLEW user the power to attempt to unlock a locked up PC remotely without rebooting the Host PC.
  • this option be run on a test basis when the PC is not mnning critical applications, before it is used in an emergency situation. Such a test insures that this menu option does not have any undesirable side effects on a Host PC or switch box.
  • the Key-VLEW Main menu bar Other menu on Figure 13 option contains several sub-menu options as follows:
  • Card Addresses This menu option permits changing the memory address and or LRQ's used by the KEY- VIEW software application to communicate with the KEY-VLEW PCI and Access Control Cards:
  • This menu option is used to configure the KEY- VIEW Access Control Card.
  • This option (shown as an example in Figure 26) configures how the KEY-VIEW PC Access Control Card operates, including: a. Enable Reboot When Less Than - This allows a user to specify a NUMBER OF RINGS from 3 to 9, whereupon, if less than the number of rings specified is detected on the phone line plugged into the KEY- VIEW Access Control Card, then the KEY-VLEW PC will be rebooted. If this option is enabled, the Enable Reboot When More Than rings option must also be enabled and vice-versa. This feature is essential to remotely reboot the KEY-VLEW PC in the event the KEY-VLEW PC should ever lock up and not pe ⁇ nit remote access. If a modem is installed in the KEY- VIEW
  • the modem should be set via pcAnywhere to answer on at least one ring more than is specified in this setting, to avoid a situation where the KEY-VLEW PC reboots before the call is answered by the modem.
  • b. Enable Reboot When More Than - This allows a user to specify a NUMBER OF RINGS from 5 to 10, whereupon, if more than the number of rings specified is detected on the phone line plugged into the KEY-VLEW Access Control Card ,then the KEY- VIEW PC will be rebooted. If this option is enabled, the Enable Reboot When Less Than rings option must also be enabled and vice-versa.
  • This feature is essential to remotely reboot the KEY- VIEW PC in the event the KEY- VIEW PC's modem should lockup and not answer a call. If a modem is installed in the KEY- VIEW PC, the modem should be set via pcAnywhere to answer on at least two rings less than is specified in this setting, to avoid a situation where the KEY- VIEW PC reboots before the call is answered by the modem. c. Enable Reboot via external modem - This allows a user to specify a 10 character password that can be provided by the remote user to cause the KEY- VIEW PC to reboot itself.
  • This remote reboot feature is handled by the KEY- VIEW PCs Access Control Card 90 and requires an external modem connected to this Access Control Card's DATA port.
  • a remote site 205 calls the external modem cormected to the NET-911 module using a terminal emulation program (such as the Hyper terminal program supplied with Windows).
  • the modem connected to the NET-911 control module is set to an autoanswer mode and will answer all incoming calls after the second ring.
  • the remote user types the password specified and, if conect, the KEY- VIEW PC immediately reboots.
  • this remote reboot feature could also be used to remotely terminate another remote user's connection to the KEY- VIEW PC, since a separate independent phone line and modem is used to cause the KEY-VLEW PC to reset.
  • Sound Options This menu option sets the sound that occurs when (1) a system message is displayed or (2) a user is remotely accessing the KEY-VLEW PC or an automated NET-911 module event is triggered.
  • the beep sound made by a PC's internal speaker is often hard to hear, especially in typical computer rooms where there is substantial of background noise.
  • audible KEY-VLEW notifications may go unnoticed. For example, many users want a loud audible sound to occur whenever someone is remotelv- accessing their site to alert any Host site personnel present that the site is being accessed.
  • Switch Resolutions This menu option pe ⁇ nits switching the graphics resolutions of the KEY-VLEW PC's screen.
  • the following settings are available: 640 x 480, 800 x 600, and 1024x768, although others are possible and are envisioned in the present invention.
  • the graphics resolution selected only applies to the KEY- VIEW PC's screen and is a convenient was to synchronize the KEY- VIEW PCs screen resolution with a remote PC's screen resolution, so that the KEY- VLEW PC appears as a full screen on the remote PC.
  • the KEY- VLEW PCs screen will automatically assume the resolution of the Host PC's screen, so that the Host PCs screen appears as a full screen on the KEY- VIEW PC.
  • Exit Menu Mode This menu options causes the KEY- VIEW PC to switch from a Menu Mode to a Host Mode.
  • the banner at the bottom of the menu screen shows all cunent info ⁇ nation related to the active Host PC. This banner always appears in this fixed location of screen whenever the KEY- VIEW PC is in a Menu Mode.
  • the information includes: the PCI Card description, the SB Hot Key, the PC ID, mouse type, mouse and video driver locations, switch box channels, and the # colors displayed.
  • Certain functions can be assigned hot keys sequences. In the Host mode, the Keyview specific hot key combinations are trapped by the Key-view application and are not passed back to the active Host PC. Some example hot key functions are: a. switch from Menu mode to Host mode, b. Repaint Active Host PC screen. c. Send selected Switch Box Command sequence to the switch box connected to the active PCI card. d. Switch between KEY- VIEW PCI cards. e.
  • KEY- VIEW PC LED Indicator
  • the KEY- VIEW Access Control Card has a connection to one of the status LED lights, normally the Turbo light, on the front of the KEY-VLEW PC. This state of this LED light indicates the status of the KEY-VLEW PC. This LED light will be OFF when the KEY-VLEW PC is in a Menu Mode and is not being remotely accessed. This light will remain ON whenever the KEY- VIEW PC is in a Host Mode and is not being remotely accessed.
  • the turbo light When the KEY-VLEW PC is being remotely access the LED will flash. More specifically, the turbo light remains OFF but flashes ON for .5 seconds every 5 seconds, whenever the KEY- VIEW PC is being remotely accessed (i.e. a pcAnywhere is "In session") and is in a Menu Mode. If the KEY-VLEW PC is in a mode where both pcAnywhere is "In Session" and the KEY-VLEW PC is in a Host Mode, the turbo light remains ON and then flashes OFF for .5 seconds every 5 seconds. Setting the turbo light in this manner coupled with the user configurable beep option gives personnel at the Host site a visible and audible indication whenever the site is being remotely accessed.
  • the remote access engine (such as pcAnywhere) will handle file transfers from the Remote site 205 to the KEY-VLEW PC 200 and vice-versa.
  • pcAnywhere for example, makes all the latest file transfer tools (e.g. drop and drag) available to the remote user.
  • getting files to the KEY- VIEW PC 200 is of little value unless the files can then be transfened to a Host PC 201-204, or vice-versa.
  • the KEY-VLEW PC can be setup to attach to the LAN and/or the Host PC's via drive mapping as part of the boot up process. If the Host PCs are also connected to the LAN (not shown, but available, in Figure 28), when a remote user 205 accesses the KEY- VIEW PC 200 via modem 218 to transfer a file to the Host site 201-204, the remote user 205 simply sends the file transfer to the drive that the Host PC's hard disk is mapped to, or suspends the KEY- VIEW application, logs into the applicable Host PC and transfers the file to that Host PC.
  • the KEY- VIEW PCs existing parallel port could be used to make file transfers to the Host PC 201 using any commercial file transfer software package such as Laplink or pcAnywhere, as long as the necessary parallel cable is connected from the KEY- VIEW PC 200 to the Host PC 201.
  • any commercial file transfer software package such as Laplink or pcAnywhere, as long as the necessary parallel cable is connected from the KEY- VIEW PC 200 to the Host PC 201.
  • Serially based file transfer software such as pcAnywhere, Laplink, or the Hyperterminal software (provided with Windows) would then be used to transfer files between the KEY- VIEW PC and Host PCs.
  • NET-911 Control Modules also pe ⁇ nit the KEY-VLEW PC to serially access and control any other serial based devices such as routers, printers, UPS systems either locally or remotely via the KEY- VIEW PC.
  • Host mode in step 4 above initiate pcAnywhere in a remote mode on the KEY-VLEW PC. Make sure the serial port parameter settings for the file transfer software being used agree with the settings noted in step 4 above. 7. Transfer all files from the KEY-VLEW PC's temporary directory setup in step I above to the active Host PC via the file transfer software being used. 8. Delete the files transfened from the KEY- VIEW PC's temporary directory. 9. Terminate file transfer processing on the KEY- VIEW PC and maximize the KEY-VLEW application that was minimized in step 5 above. 10. Switch to a Host Mode and then terminate file transfer processing on the active Host PC that was initiated in step
  • Steps identical to the above would be followed to transfer files from the active Host PC to a Remote PC except that the transfer of the files from the active Host PC to the KEY- VIEW PC's temporary directory would occur first. Then, these files would be transfened by pcAnywhere from the KEY-VLEW PC to the Remote PC. If file serial file transfer processing will not initiate between the active Host PC and the KEY- VLEW PC it is possible that a special null modem adapter may be needed on the serial cable between the PCs.
  • the KEY- VIEW APP looks at the file time and date of the pcAnywhere log file which is updated each time a user logs ON or OFF. To avoid dragging down the Host PC processor this viewing at the time and date of the file can occur approximately even- 5 seconds. No entries other than sign-off and sign-on occur to the Host log file and the file time & date is updated when either of these events occur. Other log entries, such as file transfer information, are only logged at the remote end.
  • a dummy flag file is created (in the AUTOEXEC.BAT of the Keyview PC) to tell KEY- VIEW APP to assume a remote access session is not active regardless of what the pcAnywhere log says.
  • KEY-VLEW APP would assume a session is not open then delete the dummy file, so this assumption will not be made again in a case where KEY- VIEW APP is terminated then re-loaded without rebooting the Host PC.
  • KEY-VLEW APP When a PC AW session begins, as detected by KEY- VIEW APP as described above, KEY-VLEW APP will stop re-directing all keyboard and mouse input to the Host PC and display the Keyview main menu on the Keyview PCs screen as discussed above.
  • a pcAnywhere session ends as detected by KEY- VIEW APP using the above procedure, and the user has not ended Key-view Main menu processing; the Key-view main menu is removed from the Key- view PCs screen automatically and all keyboard/mouse input re-routed from the Key-view PC to the Host PC.

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • General Health & Medical Sciences (AREA)
  • Computing Systems (AREA)
  • Health & Medical Sciences (AREA)
  • Medical Informatics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer And Data Communications (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Input From Keyboards Or The Like (AREA)
  • Saccharide Compounds (AREA)
  • Debugging And Monitoring (AREA)
  • Selective Calling Equipment (AREA)

Abstract

L'invention concerne un dispositif d'accès à distance qui permet de saisir, de numériser et de transmettre des signaux vidéo depuis un ordinateur hôte vers un ordinateur distant. L'ordinateur distant renvoie les signaux de clavier et de souris via le dispositif d'accès à distance, à destination de l'ordinateur hôte, ce qui permet de piloter l'ordinateur hôte comme si le clavier et la souris étaient directement reliés à lui. Etant donné qu'il comporte une interface de module de circuit pour l'ordinateur hôte, le dispositif peut fonctionner indépendamment de toute caractéristique de système d'exploitation associée à l'ordinateur hôte.
EP99969512A 1998-09-22 1999-09-22 Systeme et procede permettant l'acces et l'exploitation a distance sur ordinateur personnel Expired - Lifetime EP1116086B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US10143098P 1998-09-22 1998-09-22
US101430P 1998-09-22
PCT/US1999/021891 WO2000017766A2 (fr) 1998-09-22 1999-09-22 Systeme et procede permettant l'acces et l'exploitation a distance sur ordinateur personnel

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EP1116086A2 true EP1116086A2 (fr) 2001-07-18
EP1116086B1 EP1116086B1 (fr) 2007-02-21

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US (3) US6633905B1 (fr)
EP (1) EP1116086B1 (fr)
JP (1) JP4146089B2 (fr)
AT (1) ATE354824T1 (fr)
AU (1) AU774003B2 (fr)
CA (1) CA2345084C (fr)
DE (1) DE69935234T2 (fr)
HK (1) HK1043228B (fr)
IL (1) IL142119A0 (fr)
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HK1043228A1 (en) 2002-09-06
AU6055899A (en) 2000-04-10
US20070033265A1 (en) 2007-02-08
IL142119A0 (en) 2002-03-10
CA2345084A1 (fr) 2000-03-30
JP2002525750A (ja) 2002-08-13
US7747702B2 (en) 2010-06-29
EP1116086B1 (fr) 2007-02-21
JP4146089B2 (ja) 2008-09-03
WO2000017766A3 (fr) 2000-10-12
US20030217123A1 (en) 2003-11-20
US6633905B1 (en) 2003-10-14
HK1043228B (zh) 2007-10-12
AU774003B2 (en) 2004-06-10
DE69935234T2 (de) 2007-11-08
ATE354824T1 (de) 2007-03-15
WO2000017766A2 (fr) 2000-03-30
CA2345084C (fr) 2004-11-02
DE69935234D1 (de) 2007-04-05

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